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I was able to reproduce the same behavior, and this unexpected behavior has been reported on Github before.
According to the Announcing Windows Community Toolkit v8.0, Microsoft.Toolkit.Uwp.UI.Controls
has been deprecated as it is legacy and is no longer maintained. AdaptiveGridView has not been moved to the new package(CommunityToolkit.WinUI.UI.*
). You can open a discussion to garner support for future migration or to get information on contributing to migrate it for everyone.
In the meantime, it is recommended to use ItemsRepeater as an alternative.
Thank you.