XCURSOR_THEME should be specified in the environment variables. Otherwise, some
apps, Blender for example, would run with a super tiny mouse in Wayland
session.

And from missing XCURSOR_THEME, specifying XCURSOR_SIZE wouldn't work.

See Blender issue: https://projects.blender.org/blender/blender/issues/105895

It seems XCURSOR_THEME used to be specified in openSUSE. But due to issue
#1157617 (https://bugzilla.suse.com/show_bug.cgi?id=1157617), XCURSOR_THEME was
removed altogether. From my understanding, the issue #1157617 happened because
of the incorrect XCURSOR_THEME value that was specified by the system script.
The fix didn't correct the XCURSOR_THEME value, but removed XCURSOR_THEME
altogether.