Hi;
I've upgraded to XFCE 4.16 to get newer versions of xfce programs etc.
I used the ppa listed here (
https://www.debugpoint.com/2020/12/xfce-4-16-ubuntu-20-04/)and only did the first steps.
After upgrade I had to replace terminal icon shortcut and thunar shortcut.
use start menu search and look up terminal and right click add to panel and they will update/work then remove old shortcuts and move the new ones into place by start menu.
after this no other issues thus far all other apps added to panel work.
and you have a updated xfce 4.16 without xubuntu tweaks and messing with SuperGamer looks.