[iOS]VerticalOffset Not Reset to Zero After Clearing ItemSource in CollectionView

[devanathan-vaithiyanathan]

Description

VerticalOffset are not reset to 0 when ItemSource is cleared or items are removed. However, after adding items back to the ItemSource, the offset values update correctly when scrolling.

Steps to Reproduce

1. Run the attached sample.
2. Click the Fill button.
3. Click the Empty button.
4. Check the VerticalOffset value after clearing. It does not reset to zero.
5. VerticalOffsetBug.zip

Expected: Offsets reset to 0 after clearing items from ItemSource.
Actual: Offsets retain old values when items are cleared or removed but update correctly after items are added back and scrolling occurs.

Screen.Recording.2024-12-24.at.3.21.59.PM.mov

Link to public reproduction project repository

No response

Version with bug

9.0.21 SR2.1

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

macOS, iOS

Affected platform versions

iOS 18.0, mac 15.1

Did you find any workaround?

No response

Relevant log output

[similar-issues-ai]

We've found some similar issues:

• [IOS] CollectionView ScrollOffset does not reset when the ItemSource is changed in iOS. #26366 , similarity score: 85%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

Note: You can give me feedback by 👍 or 👎 this comment.

[Zhanglirong-Winnie]

This issue has been verified using Visual Studio Code 1.96.2 (9.0.21 & 9.0.10 & 9.0.0). Can repro this issue on iOS and Android platforms. This issue also reproes on latest MAUI release 9.0.21 with CollectionView2 handlers.