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looks like something under /usr/lib/vst/, most probably carla.vst, is interrupting prematurely the VST plugin scan process (qtractor_vst_scan).

don't know if it applies but maybe carla.vst still has some links to old Qt4 widget styles which cannot co-exist onto a Qt5 process address space (or/and vice-versa)... once before it would suffice to remove the styles symlink under carla.vst sub-directory, in your case:

that will do, hopefully, and won't cripple carla-vst in any major way, hopefully you will only loose some skinning or style themeing capabilities to carla-vst, but that's just sugary eye-candy, nothing fundamentally critical ;)

in case you want to revert the hack, without reinstalling Carla altogether, that is:

hth.
cheers