Lyx is unusable because of its window graphics not being updated

This is on an up-to-date Archlinux system which should mean all software is at latest release version. Software versions: lyx 2.3.3, qt5 5.13.2, xorg 1.20.5 Reproducing: Create an empty HOME dir and .lyx in it, run /usr/share/lyx/configure.py with python2, start Lyx with created HOME. I tried

Fwd: Lyx is unusable because of its window graphics not being updated

Note: Am am resending this message now, I already sent it yesterday, but it did was not approved. This is on an up-to-date Archlinux system which should mean all software is at latest release version. Software versions: lyx 2.3.3, qt5 5.13.2, xorg 1.20.5 Reproducing: Create an empty HOME dir