[MAUI]When MesureFirstItem is selected, the image sizes of I3 and I6 are inconsistent.

[RoiChen001]

Description

When MesureFirstItem is selected, the image sizes of I3 and I6 are inconsistent.

Steps to Reproduce

1.Deploy https://devdiv.visualstudio.com/Pkgs/_git/VS.TestAssets.Xaml?path=/Assets/Projects/ManualMauiTests to Maccatalyst.
2.Click I3-->Variable size items.
3.Select MesureFirstItem.
4.View page.

Actual result:
For I3(Variable size items), the result is as below. In addition, it is inappropriate to have spacing between images.

For I6(Grouping with variable sized items), the image sizes are inconsistent too.

Link to public reproduction project repository

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

Version with bug

Microsoft.Maui.Controls 8.0.70-ci.net8.24325.2.

Is this a regression from previous behavior?

Not a regression, the issue also reproduces on 8.0.61& 8.0.3.

Affected platforms

iOS, macOS

[github-actions]

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Open similar issues:

• [iOS] Item Sizing Strategy Gallery currently doesn't display items consistently. (#19064), similarity score: 0.77
• [Windows] Wrong item size on horizontal CollectionView (#17573), similarity score: 0.76
• [Windows] Wrong item size on the first item from vertical CollectionView (#17574), similarity score: 0.76
• [MAUI] I CollectionView - The layout and rendering of subpages are not displayed correctly (#23294), similarity score: 0.75

Closed similar issues:

• [Windows] Wrong CollectionView item size using MeasureFirstItem (#4113), similarity score: 0.76

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