Some applications like Atom resp. it's runtime environment Electron do not work out of the box over X2Go remote desktop because it expects at least GLX 1.3 or higher.

I found a workaround in a bug report which needs to be modified for Gentoo because Electron comes in a separate package:

# cd /usr/lib/electron
# cp /usr/lib/ .
# ln -s
# ln -s

So far I did not recognize any downsides on this.