Rapid Scrolling in TreeView Causes Application Crash in WinUI 3

[datskiy]

Describe the bug

When scrolling quickly through the TreeView items in an "up-down-up-down" sequence, the application consistently crashes. This issue occurs with the item count enough to perform long scrolls and seems to be triggered only by rapid scrolling. The amount of scrolls required to trigger the issue varies, sometimes it crashes only after 3-4 such iterations.

• Slow scrolling as well as scrolling with a mouse wheel does not seem to cause any issues.
• Similar controls such as ListView do not seem to cause such issues under the same conditions.

Exception Message
Source object type is not a projected type and does not inherit from a projected type. (Parameter 'value')

Stack Trace

at WinRT.CastExtensions.GetRefForObject(Object value)
at WinRT.CastExtensions.As[TInterface](Object value)
at TreeViewScrollingIssue.MainWindow.MainWindow_obj3_Bindings.SetDataRoot(Object newDataRoot) in \\TreeViewScrollingIssue\obj\x64\Debug\net8.0-windows10.0.19041.0\win-x64\MainWindow.g.cs:line 190
at TreeViewScrollingIssue.MainWindow.MainWindow_obj3_Bindings.ProcessBindings(Object item, Int32 itemIndex, Int32 phase, Int32& nextPhase) in \\TreeViewScrollingIssue\obj\x64\Debug\net8.0-windows10.0.19041.0\win-x64\MainWindow.g.cs:line 141
at ABI.Microsoft.UI.Xaml.Markup.IDataTemplateComponent.Do_Abi_ProcessBindings_1(IntPtr thisPtr, IntPtr item, Int32 itemIndex, Int32 phase, Int32* nextPhase)

Steps to reproduce the bug

1. Run the project: https://github.com/datskiy/TreeViewScrollingIssue
2. Start scrolling the TreeView quickly all the way up and down sequentially.
3. Observe the unhandled exception and the application crash.

Expected behavior

The TreeView should handle rapid scrolling without crashing the application, like other similar controls.

Screenshots

Unhandled exception in VS

NuGet package version

WinUI 3 - Windows App SDK 1.6.3: 1.6.241114003

Windows version

Windows 11 (24H2): Build 26100

Additional context

Source code: https://github.com/datskiy/TreeViewScrollingIssue

[tpoint75]

I have a similar issue scrolling fast a listview with more than 10000 items on some pc.
But I could not reproduce it on my development computer.