Fixed the OnPlatform does not work for header property in Collection view

[NanthiniMahalingam]

Issue Details

When setting OnPlatform for the Header property in the CollectionView, the exact value of the Header property is not displayed.

Root Cause

When OnPlatform is set for the Header property in the CollectionView, the exact T value is not retrieved from the ApplyPropertiesVisitors.

Description of Change

Updated BindableProperty.TryConvert to keep IWrappedValue instances on the conversion path so the actual wrapped value is resolved before assignment.

This ensures properties such as CollectionView.Header receive the concrete resolved value from OnPlatform instead of the wrapper type itself.

Issues Fixed

Fixes #25124

Validated the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Output images:

Android

Before	After

iOS

Before	After

macOS

Before	After

Windows

Before	After

[Copilot]

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Files not reviewed (1)

• src/Controls/tests/TestCases.HostApp/Issues/Issue25124.xaml: Language not supported

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

Pending snapshots already available in the latest build.

For example, Mac:

Could you commit the images?

[jsuarezruiz]

/rebase

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

/rebase

[kubaflo]

Could you please review the AI's summary?

[kubaflo]

Looks like the test couldn't catch a bug

[Vignesh-SF3580]

Looks like the test couldn't catch a bug

@kubaflo The previously added UI test did not reproduce the bug, as the issue occurs only in the sandbox and not in the HostApp. As a result, the gate phase failed. The UI test has been removed and replaced with a unit test that correctly captures the issue. With this change, the gate passed, and it has been updated in the AI summary. However, the AI summary still references the previous UI test, which is no longer valid since it has been replaced with a unit test.

Without Fix	With Fix

[MauiBot]

🚦 Gate - Test Before and After Fix

📊 Expand Full Gate — e4f761e · Addressed AI concerns.

---

Gate Result: ✅ PASSED

Platform: ANDROID · Base: main · Merge base: 794a9fa6

Test	Without Fix (expect FAIL)	With Fix (expect PASS)
🧪 BindablePropertyUnitTests BindablePropertyUnitTests	✅ FAIL — 158s	✅ PASS — 113s

🔴 Without fix — 🧪 BindablePropertyUnitTests: FAIL ✅ · 158s

  Determining projects to restore...
  Restored /home/vsts/work/1/s/src/TestUtils/src/TestUtils/TestUtils.csproj (in 2.98 sec).
  Restored /home/vsts/work/1/s/src/Graphics/src/Graphics/Graphics.csproj (in 248 ms).
  Restored /home/vsts/work/1/s/src/Essentials/src/Essentials.csproj (in 3.22 sec).
  Restored /home/vsts/work/1/s/src/Core/src/Core.csproj (in 851 ms).
  Restored /home/vsts/work/1/s/src/Core/maps/src/Maps.csproj (in 8.37 sec).
  Restored /home/vsts/work/1/s/src/Controls/src/Xaml/Controls.Xaml.csproj (in 282 ms).
  Restored /home/vsts/work/1/s/src/Controls/src/Core/Controls.Core.csproj (in 84 ms).
  Restored /home/vsts/work/1/s/src/Controls/Maps/src/Controls.Maps.csproj (in 108 ms).
  Restored /home/vsts/work/1/s/src/Controls/tests/Core.UnitTests/Controls.Core.UnitTests.csproj (in 1.87 sec).
  1 of 10 projects are up-to-date for restore.
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Graphics -> /home/vsts/work/1/s/artifacts/bin/Graphics/Debug/net10.0/Microsoft.Maui.Graphics.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Essentials -> /home/vsts/work/1/s/artifacts/bin/Essentials/Debug/net10.0/Microsoft.Maui.Essentials.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Core -> /home/vsts/work/1/s/artifacts/bin/Core/Debug/net10.0/Microsoft.Maui.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Maps -> /home/vsts/work/1/s/artifacts/bin/Maps/Debug/net10.0/Microsoft.Maui.Maps.dll
  Controls.BindingSourceGen -> /home/vsts/work/1/s/artifacts/bin/Controls.BindingSourceGen/Debug/netstandard2.0/Microsoft.Maui.Controls.BindingSourceGen.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Controls.Core -> /home/vsts/work/1/s/artifacts/bin/Controls.Core/Debug/net10.0/Microsoft.Maui.Controls.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Controls.Maps -> /home/vsts/work/1/s/artifacts/bin/Controls.Maps/Debug/net10.0/Microsoft.Maui.Controls.Maps.dll
  Controls.Xaml -> /home/vsts/work/1/s/artifacts/bin/Controls.Xaml/Debug/net10.0/Microsoft.Maui.Controls.Xaml.dll
  TestUtils -> /home/vsts/work/1/s/artifacts/bin/TestUtils/Debug/netstandard2.0/Microsoft.Maui.TestUtils.dll
  Controls.Core.UnitTests -> /home/vsts/work/1/s/artifacts/bin/Controls.Core.UnitTests/Debug/net10.0/Microsoft.Maui.Controls.Core.UnitTests.dll
Test run for /home/vsts/work/1/s/artifacts/bin/Controls.Core.UnitTests/Debug/net10.0/Microsoft.Maui.Controls.Core.UnitTests.dll (.NETCoreApp,Version=v10.0)
VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.21]   Discovering: Microsoft.Maui.Controls.Core.UnitTests
[xUnit.net 00:00:02.09]   Discovered:  Microsoft.Maui.Controls.Core.UnitTests
[xUnit.net 00:00:02.10]   Starting:    Microsoft.Maui.Controls.Core.UnitTests
[xUnit.net 00:00:02.26]     CollectionViewHeaderUnwrapsOnPlatformView(platformName: "iOS", expectedText: "iOS Header") [FAIL]
[xUnit.net 00:00:02.26]       Assert.IsType() Failure: Value is not the exact type
[xUnit.net 00:00:02.26]       Expected: typeof(Microsoft.Maui.Controls.Label)
[xUnit.net 00:00:02.26]       Actual:   typeof(Microsoft.Maui.Controls.OnPlatform<View>)
[xUnit.net 00:00:02.26]       Stack Trace:
[xUnit.net 00:00:02.26]         /_/src/Controls/tests/Core.UnitTests/BindablePropertyUnitTests.cs(221,0): at Microsoft.Maui.Controls.Core.UnitTests.BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(String platformName, String expectedText)
[xUnit.net 00:00:02.26]            at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
[xUnit.net 00:00:02.26]            at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
[xUnit.net 00:00:02.27]     CollectionViewHeaderUnwrapsOnPlatformView(platformName: "Android", expectedText: "Android Header") [FAIL]
[xUnit.net 00:00:02.27]       Assert.IsType() Failure: Value is not the exact type
[xUnit.net 00:00:02.27]       Expected: typeof(Microsoft.Maui.Controls.Label)
[xUnit.net 00:00:02.27]       Actual:   typeof(Microsoft.Maui.Controls.OnPlatform<View>)
[xUnit.net 00:00:02.27]       Stack Trace:
[xUnit.net 00:00:02.27]         /_/src/Controls/tests/Core.UnitTests/BindablePropertyUnitTests.cs(221,0): at Microsoft.Maui.Controls.Core.UnitTests.BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(String platformName, String expectedText)
[xUnit.net 00:00:02.27]            at InvokeStub_BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(Object, Span`1)
[xUnit.net 00:00:02.27]            at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
[xUnit.net 00:00:02.27]       Assert.IsType() Failure: Value is not the exact type
[xUnit.net 00:00:02.27]       Expected: typeof(Microsoft.Maui.Controls.Label)
[xUnit.net 00:00:02.27]       Actual:   typeof(Microsoft.Maui.Controls.OnPlatform<View>)
[xUnit.net 00:00:02.27]       Stack Trace:
[xUnit.net 00:00:02.27]         /_/src/Controls/tests/Core.UnitTests/BindablePropertyUnitTests.cs(221,0): at Microsoft.Maui.Controls.Core.UnitTests.BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(String platformName, String expectedText)
[xUnit.net 00:00:02.27]            at InvokeStub_BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(Object, Span`1)
[xUnit.net 00:00:02.27]            at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
[xUnit.net 00:00:02.27]     CollectionViewHeaderUnwrapsOnPlatformView(platformName: "WinUI", expectedText: "WinUI Header") [FAIL]
  Passed CreateWithDefaultMode [22 ms]
  Passed StructPropertyDefaultValue [14 ms]
  Passed CreateForGeneric [3 ms]
  Passed ChangingBeforeChanged [< 1 ms]
  Failed CollectionViewHeaderUnwrapsOnPlatformView(platformName: "iOS", expectedText: "iOS Header") [17 ms]
  Error Message:
   Assert.IsType() Failure: Value is not the exact type
Expected: typeof(Microsoft.Maui.Controls.Label)
Actual:   typeof(Microsoft.Maui.Controls.OnPlatform<View>)
  Stack Trace:
     at Microsoft.Maui.Controls.Core.UnitTests.BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(String platformName, String expectedText) in /_/src/Controls/tests/Core.UnitTests/BindablePropertyUnitTests.cs:line 221
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
  Failed CollectionViewHeaderUnwrapsOnPlatformView(platformName: "Android", expectedText: "Android Header") [< 1 ms]
  Error Message:
   Assert.IsType() Failure: Value is not the exact type
Expected: typeof(Microsoft.Maui.Controls.Label)
Actual:   typeof(Microsoft.Maui.Controls.OnPlatform<View>)
  Stack Trace:
     at Microsoft.Maui.Controls.Core.UnitTests.BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(String platformName, String expectedText) in /_/src/Controls/tests/Core.UnitTests/BindablePropertyUnitTests.cs:line 221
   at InvokeStub_BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(Object, Span`1)
   at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
  Failed CollectionViewHeaderUnwrapsOnPlatformView(platformName: "WinUI", expectedText: "WinUI Header") [< 1 ms]
  Error Message:
   Assert.IsType() Failure: Value is not the exact type
Expected: typeof(Microsoft.Maui.Controls.Label)
Actual:   typeof(Microsoft.Maui.Controls.OnPlatform<View>)
  Stack Trace:
     at Microsoft.Maui.Controls.Core.UnitTests.BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(String platformName, String expectedText) in /_/src/Controls/tests/Core.UnitTests/BindablePropertyUnitTests.cs:line 221
   at InvokeStub_BindablePropertyUnitTests.CollectionViewHeaderUnwrapsOnPlatformView(Object, Span`1)
   at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
  Passed CreateNonGeneric [< 1 ms]
  Passed Create [< 1 ms]
[xUnit.net 00:00:02.28]   Finished:    Microsoft.Maui.Controls.Core.UnitTests
  Passed NullableProperty [< 1 ms]
  Passed ValueTypePropertyDefaultValue [< 1 ms]
  Passed CreateCasted [< 1 ms]
  Passed EnumPropertyDefaultValue [< 1 ms]

Test Run Failed.
Total tests: 13
     Passed: 10
     Failed: 3
 Total time: 2.9878 Seconds

🟢 With fix — 🧪 BindablePropertyUnitTests: PASS ✅ · 113s

  Determining projects to restore...
  All projects are up-to-date for restore.
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Graphics -> /home/vsts/work/1/s/artifacts/bin/Graphics/Debug/net10.0/Microsoft.Maui.Graphics.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Essentials -> /home/vsts/work/1/s/artifacts/bin/Essentials/Debug/net10.0/Microsoft.Maui.Essentials.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Core -> /home/vsts/work/1/s/artifacts/bin/Core/Debug/net10.0/Microsoft.Maui.dll
  Controls.BindingSourceGen -> /home/vsts/work/1/s/artifacts/bin/Controls.BindingSourceGen/Debug/netstandard2.0/Microsoft.Maui.Controls.BindingSourceGen.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Maps -> /home/vsts/work/1/s/artifacts/bin/Maps/Debug/net10.0/Microsoft.Maui.Maps.dll
  Controls.Core -> /home/vsts/work/1/s/artifacts/bin/Controls.Core/Debug/net10.0/Microsoft.Maui.Controls.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Controls.Xaml -> /home/vsts/work/1/s/artifacts/bin/Controls.Xaml/Debug/net10.0/Microsoft.Maui.Controls.Xaml.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13750580
  Controls.Maps -> /home/vsts/work/1/s/artifacts/bin/Controls.Maps/Debug/net10.0/Microsoft.Maui.Controls.Maps.dll
  TestUtils -> /home/vsts/work/1/s/artifacts/bin/TestUtils/Debug/netstandard2.0/Microsoft.Maui.TestUtils.dll
  Controls.Core.UnitTests -> /home/vsts/work/1/s/artifacts/bin/Controls.Core.UnitTests/Debug/net10.0/Microsoft.Maui.Controls.Core.UnitTests.dll
Test run for /home/vsts/work/1/s/artifacts/bin/Controls.Core.UnitTests/Debug/net10.0/Microsoft.Maui.Controls.Core.UnitTests.dll (.NETCoreApp,Version=v10.0)
VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
[xUnit.net 00:00:00.01] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.62]   Discovering: Microsoft.Maui.Controls.Core.UnitTests
[xUnit.net 00:00:04.10]   Discovered:  Microsoft.Maui.Controls.Core.UnitTests
[xUnit.net 00:00:04.12]   Starting:    Microsoft.Maui.Controls.Core.UnitTests
  Passed CreateWithDefaultMode [38 ms]
  Passed StructPropertyDefaultValue [24 ms]
  Passed CreateForGeneric [3 ms]
  Passed ChangingBeforeChanged [5 ms]
  Passed CollectionViewHeaderUnwrapsOnPlatformView(platformName: "iOS", expectedText: "iOS Header") [49 ms]
  Passed CollectionViewHeaderUnwrapsOnPlatformView(platformName: "Android", expectedText: "Android Header") [< 1 ms]
  Passed CollectionViewHeaderUnwrapsOnPlatformView(platformName: "WinUI", expectedText: "WinUI Header") [< 1 ms]
  Passed CreateNonGeneric [2 ms]
  Passed Create [< 1 ms]
[xUnit.net 00:00:04.48]   Finished:    Microsoft.Maui.Controls.Core.UnitTests
  Passed NullableProperty [< 1 ms]
  Passed ValueTypePropertyDefaultValue [< 1 ms]
  Passed CreateCasted [2 ms]
  Passed EnumPropertyDefaultValue [< 1 ms]

Test Run Successful.
Total tests: 13
     Passed: 13
 Total time: 6.1676 Seconds

📁 Fix files reverted (2 files)

• eng/pipelines/ci-copilot.yml
• src/Controls/src/Core/BindableProperty.cs

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[MauiBot]

🤖 AI Summary

📊 Expand Full Review — e4f761e · Addressed AI concerns.

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🔍 Pre-Flight — Context & Validation

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Issue: #25124 - OnPlatform does not work in Header of CollectionView
PR: #28935 - Fixed the OnPlatform does not work for header property in Collection view
Platforms Affected: Android, iOS, Windows, macOS (all platforms)
Files Changed: 1 implementation, 1 test

Key Findings

• CollectionView.Header is typed as object. When OnPlatform<View> is assigned via XAML, BindableProperty.TryConvert hits the early-return guard if (returnType.IsAssignableFrom(valueType)) — since object.IsAssignableFrom(OnPlatform<View>) is always true, the method returns without unwrapping the IWrappedValue.
• The fix adds && value is not IWrappedValue to force fall-through to TypeConversionHelper.TryConvert, which properly resolves OnPlatform<T> via its implicit cast operator to yield the platform-specific value.
• Both OnPlatform<T> and OnIdiom<T> implement IWrappedValue, so both are fixed by this single guard.
• The PR originally included a UI test (Issue25124.cs in HostApp) but it was replaced with a unit test because the issue is not reproducible in HostApp. The UI test files are no longer in the diff.
• Test type: Unit test in Controls.Core.UnitTests (BindablePropertyUnitTests.cs).
• Gate: ✅ PASSED — CollectionViewHeaderUnwrapsOnPlatformView fails without fix, passes with fix.
• Prior agent review found (same commit e4f761e): all phases complete, APPROVE recommended.
• PR labels include s/agent-reviewed, s/agent-approved, s/agent-fix-implemented, s/agent-fix-pr-picked.

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #28935	Add && value is not IWrappedValue guard in BindableProperty.TryConvert to bypass early-return when value is a wrapped type	✅ PASSED (Gate)	BindableProperty.cs, BindablePropertyUnitTests.cs	Original PR

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🔧 Fix — Analysis & Comparison

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Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
1	try-fix (claude-opus-4.6)	Eager IWrappedValue unwrapping block at top of TryConvert — before IsAssignableFrom check	✅ PASS	BindableProperty.cs (+10 lines)	All 3 test cases passed
2	try-fix (claude-sonnet-4.6)	Pre-unwrap IWrappedValue in BindableObject.SetValueCore before TryConvert is called	✅ PASS	BindableObject.cs (+3 lines)	All 3 test cases passed; fixes at higher call site
3	try-fix (gpt-5.3-codex)	Reorder TryConvert: move TypeConversionHelper.TryConvert call BEFORE IsAssignableFrom fast-path	✅ PASS	BindableProperty.cs (+3/-3 lines)	All 3 test cases passed; changes call order for ALL conversions
4	try-fix (gpt-5.4, gemini unavailable)	Unwrap IWrappedValue inside the IsAssignableFrom fast-path branch via TypeConversionHelper.TryConvert	✅ PASS	BindableProperty.cs (+5 lines)	All 3 test cases passed
PR	PR #28935	Add && value is not IWrappedValue guard in BindableProperty.TryConvert to bypass early-return when value is wrapped type	✅ PASSED (Gate)	BindableProperty.cs, BindablePropertyUnitTests.cs	Original PR

Cross-Pollination

Model	Round	New Ideas?	Details
claude-opus-4.6	2	No	NO NEW IDEAS — 5 approaches fully cover the SetValue→TryConvert interception space

Exhausted: Yes
Selected Fix: PR's fix — most minimal and surgical (1 condition added, zero new methods, zero changed call sites), confined to exactly the problematic code path. Attempts 1–4 all pass but each adds more code or changes broader call patterns.

Cross-Pollination

Model	Round	New Ideas?	Details

Exhausted: No (in progress)
Selected Fix: Pending

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📋 Report — Final Recommendation

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✅ Final Recommendation: APPROVE

Phase Status

Phase	Status	Notes
Pre-Flight	✅ COMPLETE	Issue #25124, 2 files changed (1 impl + 1 test)
Gate	✅ PASSED	android · unit test CollectionViewHeaderUnwrapsOnPlatformView fails without fix, passes with fix
Try-Fix	✅ COMPLETE	4 attempts (all ✅ PASS); cross-pollination exhausted; PR's fix selected
Report	✅ COMPLETE

Summary

PR #28935 fixes OnPlatform<T> not resolving when used with CollectionView.Header (an object-typed property). The fix is a single condition added to BindableProperty.TryConvert. Four independent alternative approaches all passed the same gate test, confirming the root cause diagnosis. The PR's fix is the most surgical of all five passing candidates and is recommended for approval.

Root Cause

CollectionView.Header is typed as object. When OnPlatform<View> is assigned, BindableProperty.TryConvert hit the early-return guard:

if (returnType.IsAssignableFrom(valueType))
    return true;   // ← exits here without unwrapping IWrappedValue

Since object.IsAssignableFrom(OnPlatform<View>) is always true, the method returned without falling through to TypeConversionHelper.TryConvert, which is responsible for resolving IWrappedValue instances (like OnPlatform<T> and OnIdiom<T>) via their implicit conversion operators.

Fix Quality

PR's fix: Adds && value is not IWrappedValue to the IsAssignableFrom guard — one condition change, zero new methods, zero changed call sites.

Strengths:

• ✅ Minimal: 1-condition change confined to exactly the failing code path
• ✅ Correct: Forces fall-through to TypeConversionHelper.TryConvert which already has robust IWrappedValue handling
• ✅ Covers both OnPlatform<T> and OnIdiom<T> (both implement IWrappedValue)
• ✅ Gate-verified: unit test fails without fix, passes with fix (all 3 platform cases)
• ✅ Unit test is appropriate: directly exercises the bug scenario via CollectionView.Header = new OnPlatform<View>()

Try-Fix comparison:

#	Approach	Size	Risk	Verdict
1	Eager unwrap at top of TryConvert	+10 lines	Low	Valid but verbose; needs null handling block
2	Pre-unwrap in SetValueCore	+3 lines	Medium	Operates at higher level; more side-effect surface area
3	Reorder TryConvert call sequence	+3/-3 lines	Higher	Changes call order for ALL conversions — regression risk
4	Unwrap inside IsAssignableFrom branch	+5 lines	Low	Similar to PR but adds a nested branch
PR	&& value is not IWrappedValue guard	+1 condition	Lowest	Winner: most targeted, least invasive

Selected Fix: PR's fix (s/agent-fix-pr-picked)

Minor observations (non-blocking):

• ⚠️ The unit test uses Assert.IsType<Label> which is correct and appropriately exercises the conversion. A brief comment explaining why CollectionView.Header ends up as a Label (via OnPlatform<View> implicit operator) would improve readability for future maintainers — but this is cosmetic only.
• ⚠️ The fix guards exclusively on IWrappedValue. Any future type implementing IWrappedValue that is also directly assignable to the return type will now fall through to TypeConversionHelper. This is intentional and safe — TypeConversionHelper handles the case where targetType.IsAssignableFrom(wrappedType) and returns the unwrapped value, so there is no regression risk.

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