[Bug] Android TitleView lose Labels while rotating

[AlleSchonWeg]

Description

Android looses lables if you rotate the device a few times and change orientation at the parent StackLayout.

Steps to Reproduce

1. Open : https://github.com/AlleSchonWeg/Xamarin.Forms
2. Goto TitleView Gallary Page
3. Rotate the device few times

Expected Behavior

All two labels should display

Actual Behavior

Only one label remains

Basic Information

• Version with issue: -
• Last known good version: Current 5.0.0 branch
• Platform Target Frameworks:
  • iOS:
  • Android:
  • UWP:
• Android Support Library / AndroidX Version:
• NuGet Packages:
• Affected Devices:

Environment

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Build Logs

Screenshots

Before rotation

After rotation:

Reproduction Link

Workaround

[AlleSchonWeg]

I tried to set HeightRequest to the parent StackLayout in OnSizeAllocated. 56 for portrait and 48 for landscape. Now all labels are visible, but when rotating the labels "jump" sometimes. Because the parent StackLayout resizes after the rotation is completed. Specially from landscape to portrait.
Can't set VerticalOptions="FillAndExpand" because it's not working with android. See old issue: #12392