[Bug] setting Shell.NavBarIsVisible="False" disables interaction in collectionview's group headers on iOS

[softlion]

Description

When having Shell.NavBarIsVisible="False" on the main page, then opening a sub page, then going back to the main page,
any active element (ie: buttons) inside any of the collectionview's group header does not react anymore to tap.

This happens only on iOS (iPhone and iPad). On Android there is no issue.

Remove Shell.NavBarIsVisible="False" and all starts working as expected.

Steps to Reproduce

See repro project, AboutPage.xaml

1. Run the project
2. Tap on an item (not in a group header)
3. Tap back
4. Try to tap on the button (which lies in the group header). It won't react.

Expected Behavior

The button reacts and the child page opens

Actual Behavior

Nothing happens

Basic Information

• Version with issue: all
• Last known good version: none
• Platform Target Frameworks:
  • iOS: 15.4
• NuGet Packages: Xamarin.Forms 5.0.0.2337 (stable), 5.0.0.8028 (preview)
• Affected Devices: iPhones, iPads

Reproduction Link

https://github.com/vapolia/TestBugCollectionView

Workaround

Remove Shell.NavBarIsVisible="False" and all start working as expected.

But the nav bar stays visible .... So this is not a workaround, this is an indicator of the origin of the bug.

[softlion]

Ok i've looked at https://github.com/xamarin/Xamarin.Forms/blob/5.0.0/Xamarin.Forms.Platform.iOS/CollectionView/GroupableItemsViewController.cs

My guess is that Shell resets the page content when it navigates back to it, and this GroupableItemsViewController control is not fully compatible with the way shell rebinds the data. It has some internal cache for the viewmodel.
Maybe i'm completely aside the issue though.