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Created attachment 24792 [details]
Demo project reproducing the problem
An existing application, compiled and running now on Android Oreo has a different behavior (probably because of changes in Oreo itself).
So now the UI is broken. But as the UI should be independent of the platform (and in fact the same app runs fine in iOS), then probably the fixes should be done in the Forms library.
You can see in the attached project that the in the UI only one button is visible, while before this was used to place the button at the bottom of the form.
I'm using Xamarin.Forms 18.104.22.1680; I've tried also with version 22.214.171.1249-pre2 with same results.
I attach the solution with a demo project showing this.
It seems like we're unable to reproduce this -- the app looks the same on both an S8 device as well as an 8.0 emulator, and I've had a second validation that this behavior seems to be the same. Can you maybe give us some more info on what the app looks like when you run it, and if you're on a physical device running 8.0, perhaps? We'd like to figure this out, of course, but so far we aren't having any luck. I'll attach a screenshot of the emulator to show the page with the buttons both showing.
Created attachment 24841 [details]
Oreo emulator screenshot
Sorry the problem was in the first screen.
I don't know what has happened, but today it is working.
Sorry for the loss of time, you can close the bug.
Marking as resolved. Please reopen if a definitive issue crops up.