On iOS, using XF 18.104.22.168, if the user hits the Back button very quickly after initiating navigation to another page, the other page gets added to the NavigationStack but not removed again. This occurs when animation is being used in the Navigation.PushAsync call. I haven't reproduced it without animation, but that could just be because I'm too slow hitting the Back button when there is no animation.
So, the steps to reproduce are:
(1) Initiate an action that results in Navigation.PushAsync(page, true);
(2) The moment the new page starts appearing, hit the Back button
(3) The new page disappears and the original is shown again
(4) Check the NavigationStack - the page that is no longer visible is still on the stack.
Can you try with 2.3.2-pre1 and see if the issue still exists.
Oh i didn't send my PR for this fix.. so never mind the last comment
*** This bug has been marked as a duplicate of bug 39908 ***