Comment # 8 on bug 1225991 from Stefan Hundhammer

Created attachment 875331 [details]
Screenshot: Testing keyboard layouts

I just booted into a Leap 15.6 installation running in a VirtualBox VM.

I tested the same 3 keys repeatedly with different keyboard layouts: The two
right to the normal letter keys here:

      U  I  O  P  [
    H  J  K  L  ;  '

I started with US (;'[), then Norwegian, Swedish, Danish, and Norwegian again.
AFAICS they all worked as expected; see screenshot.

The ISO I used was  openSUSE-Leap-15.6-DVD-x86_64-Build709.1-Media.iso.

Could you try to boot into the installation medium again and try again directly
from the first interactive installation dialog (as in this screenshot)? Does it
behave differently than what you experienced in the installed system? Does it
work here or not?