TreeViewItem.IsExpanded in 1.6 behaves inconsistently when repopulating the TreeView

[usakgb]

Describe the bug

When using TreeView's item template and setting TreeViewItem.IsExpanded to True in XAML, repopulating (clearing item and then adding new items) the tree a few times collapses all items.
When binding TreeViewItem.IsExpanded to a read-only property set to True, repopulating the tree randomly collapses/expands the items.
1.5 doesn't have this issue.

Steps to reproduce the bug

A project that demonstrates the bug: https://github.com/usakgb/WinUITreeViewBug

1. Clone and run the project.
2. Click Repopulate button a few times.

Expected behavior

All items to be expanded at all times.

Screenshots

NuGet package version

Windows App SDK 1.6.3: 1.6.241114003

Packaging type

Packaged (MSIX)

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

Visual Studio 2022

Additional context

No response

[github-actions]

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