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Created attachment 18453 [details]
The Toolbar subtitle text set via a custom NavigationPage renderer is removed when the screen orientation changes. This happens because the Toolbar is reset every time OnLayout() is called: https://github.com/xamarin/Xamarin.Forms/blob/master/Xamarin.Forms.Platform.Android/AppCompat/NavigationPageRenderer.cs#L282
### Steps to Reproduce
1. Run the attached Android project
2. Rotate the device/emulator
### Expected Results
The subtitle text will remain.
### Actual Results
The Toolbar subtitle text will disappear.
You can detect when the Height or Width changes in OnElementPropertyChanged() which should indicate an orientation change and call SetSubtitle() again.
### Testing Info
Tested with Forms 2.3.2 and 2.3.3-pre3
Should be fixed in 2.3.4-pre1. Thank you!
I have checked this issue with Xamarin.Forms 2.3.4-pre1 and observed that this issue has been fixed.
Hence closing this issue.