I tried to start LMMS and the package seems to be broken. ZynadsubFX and Carla are gone.
Both do show up if I start the appimage version of LMMS, or the version I compiled myself.
So although, I do not have a problem myself, other people trying LMMS will have issues.
I noticed in YAST the package builders are aware of issues.
The solution for now, download LMMS from here:
https://lmms.io/download#linux
Do not download LMMS from any other website.
After download set the appimage file to be executable. Double click the file to start LMMS.
For Carla to show up in LMMS, you need to have Carla installed. Carla from our official repositories works fine for this.
Another solution is to install geekos daw.
https://geekosdaw.tuxfamily.org/en/
This is an official opensuse repository.