I just did an upgrade from F37 to F38. I really did not use this system on F37, still for the most part using my F35 system (mostly migrated now), but...
<alt-F4> was for closing a window, and <shift-alt-F4> for switching terminal sessions with session F1 being the graphic one.
Now both switch terminal sessions.
It seems that whatever <alt-F?> should have done still took place as well as the session switch.
thanks