Yes caffe is a runner in bottles. Try it to see if it works for the game. Bethesda BattleNet Launcher works with it.
Make sure to update the distro if possible.
Sometimes restarting the device if you never do, might help in certain scenarios. Some updates need a restart even though most don't on Linux.
EDIT:
You can try running the Battlenet launcher on lutris and running diablo 4 through instead of standalone. Blizzard launcher sometimes with updates breaks the launching on lutris. It's why I suggest to try caffe on bottles. Download the .exe for the battlenet launcher and install it on bottles with caffe runner and run it there. Hopefully some of this might fix it. Or someone that has used Suse with more experience might suggest what to do. I don't have that game but these suggestions are based on my problems with Battlenet launcher for the last year.