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[release/11.0.1xx-preview2] Fix NullReferenceException when binding to Dictionary<Enum, object> with x:DataType - #34244

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[release/11.0.1xx-preview2] Fix NullReferenceException when binding to Dictionary<Enum, object> with x:DataType#34244
github-actions[bot] wants to merge 2 commits into
release/11.0.1xx-preview2from
backport/pr-32916-to-release/11.0.1xx-preview2

Report diagnostic for unknown enum members and fix test assertion

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Azure Pipelines / maui-pr (Build .NET MAUI Build Windows (Debug)) failed Feb 25, 2026 in 14m 37s

Build .NET MAUI Build Windows (Debug) failed

1 errors / 4 warnings

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Check failure on line 496 in src\Controls\src\SourceGen\CompiledBindingMarkup.cs

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@azure-pipelines azure-pipelines / maui-pr (Build .NET MAUI Build Windows (Debug))

src\Controls\src\SourceGen\CompiledBindingMarkup.cs#L496 

src\Controls\src\SourceGen\CompiledBindingMarkup.cs(496,16): error CS0037: (NETCORE_ENGINEERING_TELEMETRY=Build) Cannot convert null to 'bool' because it is a non-nullable value type
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