So, I’ve tried the stable and the newly released rc1 version of 5.11 and they seem to work fine now, thanks.
However, whenever I export directly to GIMP 2.10 using either appimage, most of the icons in GIMP fail to load (see pic below) and when exporting to GIMP 2.99, the splash screen of GIMP loads, but not the program itself.
Everything works as expected when using RT 5.9, which is a system version from the debian repository.
Any ideas?