Mups
same here, 1.21.1 neoforge 21.1.169
The server now starts but no one can join because of an error debug log: https://mclo.gs/qw7sSDt Screenshot: 
Just did it and now no more problems joining! Ill find more problems soon when ill continue testing
I also came across this issue, Android 15 QPR1, this blank space also appears on landscape. The versions I have tried are from F-Droid and from Github Releases (1.30.3) 