[MAUI][iOS18.0][macOS15.0] I6 & I9 - Clicking on some pages will throw an exception.

[Zhanglirong-Winnie]

Description

I6 & I9 - Clicking on some pages will throw an exception. Note: This issue seems to have nothing to do with the MAUI control version, but is related to the iOS simulator. The iOS17.5 simulator does not repro this issue. Affected case: I6 - Grouping Vertical list with DataTemplates I6 - Grouping including empty groups for Vertical list with DataTemplates. I6 - Grouping with variable sized items for Vertical list with DataTemplates. I6 - Grouping with GridItemsLayouts for Vertical list with GridItemsLayout.VerticalItemSpacing. I9 -Scroll by index for grouped data. I9 -Scroll by object for grouped data.

Steps to Reproduce

1. Install Xcode16.0 + Sonoma (macOS 14.5+)
2. Deploy https://devdiv.visualstudio.com/Pkgs/_git/VS.TestAssets.Xaml?path=/Assets/Projects/ManualMauiTests to iOS 18.0 simulator.
3. Navigate to 'I9_Scrolling'-> Click 'Scroll by index for grouped data' or 'Scroll by object for grouped data'
4. Observe that the exception is thrown

Actual Behavior: The page throws an exception: ObjCRuntime.ObjCException: 'Objective-C exception thrown. Name: NSInternalInconsistencyException Reason: Expected dequeued view to be returned to the collection view in preparation for display. When the collection view's data source is asked to provide a view for a given index path, ensure that a single

Expected Behavior: The page displays normally and no exception is thrown.

Link to public reproduction project repository

https://devdiv.visualstudio.com/Pkgs/_git/VS.TestAssets.Xaml?path=/Assets/Projects/ManualMauiTests

Version with bug

Microsoft.Maui.Controls 8.0.82

Is this a regression from previous behavior?

Not a regression, the issue also repro on 8.0.90 & 8.0.72 & 8.0.3.

Affected platforms

iOS

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Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it. Thank you!

Open similar issues:

• [MAUI]I3_Sizing & I6_Grouping-Variable size items for vertical list throw exception after scrolling (#23373), similarity score: 0.82
• [MAUI] I6 Grouping - 'Grouping for Vertical list without DataTemplates' page loading exception (#23293), similarity score: 0.80
• [Unstable][MAUI]I9_Scrolling_SnapPoints page throws System.ObjectDisposedException after setting SnapPointsType. (#23528), similarity score: 0.79
• [MAUI] I CollectionView - The layout and rendering of subpages are not displayed correctly (#23294), similarity score: 0.76
• [MAUI] I4_ Selection - Click the 'Single pre-selection for Vertical list ' item will throw an exception: Object reference not set to an instance of an object (#23332), similarity score: 0.76

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[tj-devel709]

I believe it is expected that there will be exceptions with Xcode 16 currently until support lands in November. https://github.com/dotnet/maui/issues/24819.

Perhaps this issue can be closed for now and reopened later when support is added if this is still an issue, or can be left here brought back up in November, thanks!

[QianaJiao]

As for debug on MacCatalyst, this issue also repro on MacOS Sequoia 15.0, not repro on Mac Sonoma 14.6.1

[Zhanglirong-Winnie]

This issue does not reproduce on Xcode16 iOS18 Microsoft.Maui.Controls 8.0.99-ci.net8.24509.1.

[jfversluis]

@Zhanglirong-Winnie can you try again with the latest available versions please? Thanks!

[Zhanglirong-Winnie]

Hi, @jfversluis Verify this issue does not reproduce on Xcode16 iOS18 Microsoft.Maui.Controls 8.0.92.

[jfversluis]

OK Seems like this is fixed then, thank you!