Łukasz, is the "after restart" terminal output complete? Please also attach your ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml to this report.
Łukasz, is the "after restart" terminal output complete? Please also attach your ~/.config/ xfce4/xfconf/ xfce-perchannel -xml/xfce4- keyboard- shortcuts. xml to this report.