I’ve been having what I believe is the same issue on iOS. Dunno which version it started with and I’m on the beta, but it fits the entire content within the phone’s display instead of how the content is typically displayed zoomed in to the corners get rounded with the display’s rounded corners. (Hope that made sense; it’s hard to explain)

This happens to me but only when I post a comment. Happened just now lol

Normal

Weird

This is not reproducible now that I created this post, but the last twenty minutes, I've been messing with navigation to make it go away, and the only thing that worked was force close and reopen. Now it's not doing it. Shrug...