Moving items in grouped CollectionView is moving the wrong items

[tranb3r]

Description

When moving items in a grouped CollectionView, after moving several groups and items, the CollectionView starts behaving strangely, and it looks like it's moving the wrong items.

Steps to Reproduce

1. Open the repro project.
2. Open the second tab with a grouped CollectionView.
3. Move items in the second group: it works properly.
4. Move group1 down and up again.
5. Move items in the second group: it seems like item1 from group1 is also moving now.

Move items in Group2: OK
untitled2.webm

Move Group1: OK
untitled1.webm

Move items in Group2: KO
untitled3.webm

Link to public reproduction project repository

https://github.com/tranb3r/Issues/tree/main/MauiAppCollectionViewReorder

Version with bug

8.0.14 SR3.1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

No workaround

Relevant log output

No response

[ninachen03]

Verified this issue with Visual Studio 17.10.0 Preview 2(8.0.14 & 8.0.10). Can repro on android platform with sample project.