[.NET10]I2_Spacing - Vertical list and Vertical grid pages have different abnormal behaviors when clicking Update after changing the spacing value

[Ying-6]

Description

I2 Spacing - Vertical & Horizontal list pages change the Spacing value again and clicks Update, there will be an exception, and the Vertical & Horizontal grid pages will be stuck for a while when clicking Update.

Affected case:
Test Case 2085969: I2 - Vertical list for ItemSpacing
Test Case 2085971: I2 - Horizontal list for ItemSpacing
Test Case 2085978: I2 - Vertical grid for HorizontalItemSpacing and VerticalItemSpacing
Test Case 2085980: I2 - Horizontal grid for HorizontalItemSpacing and VerticalItemSpacing

Steps to Reproduce

1. Deploy https://devdiv.visualstudio.com/Pkgs/_git/VS.TestAssets.Xaml?path=/Assets/Projects/ManualMauiTests to iOS/Maccatalyst
2. Click or tap on category 'I' for 'CollectionView'
3. Click or tap on test 'I2 Spacing'
4. Click or tap on 'Vertical list' for 'ItemSpacing'.
5. Set a spacing value and click Update -> Click Back
6. Click or tap again on 'Vertical list' for 'ItemSpacing'
7. Set a spacing value and click Update

Actual result:
1. Vertical list and Horizontal list for ItemSpacing: After clicking Update again, there will be an exception

Exception information:

2. Vertical grid and Horizontal grid for HorizontalItemSpacing: After changing the Spacing value and then click Update, it gets stuck for a while

Expected result:
The Monkeys changes vertically according to the set value

Link to public reproduction project repository

https://devdiv.visualstudio.com/Pkgs/_git/VS.TestAssets.Xaml?path=%2FAssets%2FProjects%2FManualMauiTests

Version with bug

10.0.100-preview.1.25107.6

Is this a regression from previous behavior?

Yes, this is a regression. This issue does not repro on 9.0.40-ci.main.25110.1 and 9.0.30

Affected platforms

macOS, iOS

[similar-issues-ai]

We've found some similar issues:

• [MAUI] I2_Spacing - Updating the vertical and horizontal spacing, the part of layout will change. #23305 , similarity score: 83%
• [MAUI] I2_Spacing - Updating the vertical list spacing value will cause the CollectionView spacing to change as well. #23297 , similarity score: 82%

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

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[Ying-6]

This issue also reproes on 10.0.100-preview.1.25107.6 with CollectionView2 handlers.