SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE Cannot mix incompatible Qt library (5.15.2) with this library (5.15.3) Aborted (core dumped)
This is your problem, your distribution has failed to rebuild some packages after updating Qt, not something we're responsible on. Since I see you're using ArchLinux, you probably have some style or something installed via AUR that needs rebuiling, go and ask in ArchLinux user support forums as to which one it may be.