Please see this screenshot:
As you can see, the floating button is partially hidden. Scrolling does not fix the issue. Nor restarting the app.
EDIT: just found out that the issue only happens when viewing posts. If I open a post, the floating button is fully shown. That is, when viewing comments, the button is shown correctly.
Darn. I was hoping this could be explained by a mismeasurement of the screen dimensions. I tried fiddling around with NAV buttons on and couldn’t reproduce it, but I’m also on Android 16. :(