Nested ObservableCollection crashes when removing item

[WillyWoe]

Describe the bug

When removing an item in a nested ObservableCollection, tha app crashes with System.ArgumentOutOfRangeException: 'This collection cannot work with indices larger than Int32.MaxValue - 1 (0x7FFFFFFF - 1). (Parameter 'index')'

I attached a small example that reproduces the bug
Example.zip

the example consists of 2 ItemsView, one represents the headers and the second represents the details of the selected header.

Steps to reproduce the bug

1. Click on Add Header
2. Select Header 0
3. Click on Add Detail
4. Click on Add Detail again
5. Select Detail 1
6. Click on Remove Detail
7. Select Detail 0
8. Click on Remove Detail
9. App crashes

Recording.2024-08-01.mp4

Expected behavior

App does not crash when an item is removed

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.5.5: 1.5.240627000

Windows version

Windows 11 (22H2): Build 22621, Windows 10 (20H2): Build 19042

Additional context

No response

[codendone]

This was closed as duplicate of an active internal bug. Reactivating and connecting to that bug.