FOR THOSE HAVING TROUBLE WITH THIS ISSUE, THE FIX IS HERE: https://github.com/LMMS/lmms/issues/6587

Not sure if manjaro is the cause, but I've been running LMMS 1.2.2-12 on my Raspberry Pi 4, and after the new update, when loading LMMS, it gets stuck on "Preparing UI" for a bit, then the loading screen closes and nothing happens. When trying to load it from the terminal, I have tried restarting my computer. I have tried reinstalling LMMS. I also checked htop and LMMS didn't seem to be open at all.
I get these errors.

*** WEAK-JACK: initializing
*** WEAK-JACK: OK. (0)
Notice: could not set realtime priority.
Segmentation fault (core dumped)