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I was able to solve this problem by deleting global menu add-on for XFCE, since gdb reported many things connected with Qtlibraries

My guess is that one of this add-on's dependency has created a problem, specifically
vala-panel-appmenu-registrar-git 0.7.3-1 for it's purpose is: Small utility to hold DBusMenu menus which creates a conflict

So, if someone stumbles upon the same problem - make sure you don't have a global menu add-on and try deleting it, to see if it changes things

Good luck!