[Bug] Regression bug shell: when adding multiple items in FlyoutItem, only first one is shown

[KoenMat]

Description

If I add a list of ShellContent items in a FlyoutItem (AsMultipleItems), only the first one is shown. These ShellContent items are created in "OnNavigating" when you click on another FlyoutItem that acts as an "expander".
This worked fine before, but since XF4.6.0.726 it is broken.
I created a reproduction sample project, based on the default shell template.
Problem exists in Android and iOS (simulator and real device)

Steps to Reproduce

1. Run the sample with XF version prior to XF4.6.0.726
2. Access flyout and click on "Expander". This adds three items. (you can click again to remove the items, but this is no problem)
3. Now use XF4.6.0.726 or later. You will notice that only "Item 0" is visible, although all three items exist.

Expected Behavior

All added items shoud be visible

Actual Behavior

Only the first item is visible

Basic Information

• Version with issue: 4.6.0.726
• Last known good version: 4.6.0.529-pre3
• IDE: visual studio 16.4.6 and 16.6.2
• Platform Target Frameworks:
  • iOS: 12.2 / 13.2
  • Android: 9.0
• Affected Devices: All

Workaround

None

Reproduction Link

IssueShellFlyout.zip