Qube's icon cache within dom0

there are icons in the /home/username/.local/share/qubes-appmenus/ such as /home/username/.local/share/qubes-appmenus/qube-name/icon-name.png that are auto generated.

  1. is there any cache stored for them?
    if yes, how do I clear it?
  2. how exactly are they generated?

I’m asking this because I have vscodium installed in my debian 13 qube and the icon from the icon theme doesn’t apply, despite I installed that icon theme for both the qube and dom0.