[Android] Group Header/Footer Repeated for All Items When IsGrouped is True for ObservableCollection

[NafeelaNazhir]

Description

On Android, when IsGrouped is set to True and the ItemsSource is set to ObservableCollection. The GroupHeaderTemplate and GroupFooterTemplate are incorrectly applied to every individual item in the collection. For example, if the ObservableCollection contains 4 items, the group header and footer are displayed 4 times, once for each item instead of showing list.

Screen.Recording.2025-04-07.at.4.21.54.PM.mov

Steps to Reproduce

1. Run the Application IsGroupedSample 2.zip
2. Select ItemSource= Observablecollection or List , IsGrouped= true, Select GroupHeaderTemplate and GroupFooterTemplate .
3. Observe the behavior of the CollectionView.

Expected Behaviour:

• The GroupHeaderTemplate and GroupFooterTemplate should only be applied when the ItemsSource is a grouped collection.
• When using a flat ObservableCollection, only the individual items should be displayed, without any group headers or footers.
• The GroupHeaderTemplate and GroupFooterTemplate should not be applied to individual items in the ObservableCollection.

Actual Behaviour:

• The GroupHeaderTemplate and GroupFooterTemplate are incorrectly applied to each item in the flat ObservableCollection, resulting in multiple headers and footers—one for every item—even though the data is not grouped.

Link to public reproduction project repository

No response

Version with bug

9.0.50 SR5

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[similar-issues-ai]

We've found some similar issues:

• Android - Dynamic Updates to CollectionView Header/Footer and Templates Are Not Displayed #28676 , similarity score: 82%
• CollectionView Displays Blank UI When Changing IsGrouped and ItemsSourceType #28826 , similarity score: 81%

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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[nivetha-nagalingam]

This issue has been verified in Visual Studio Code (1.98.2) with MAUI versions (9.0.50 & 9.0.0 & 8.0.100). It can be reproduced on Android.