Tried telegram-desktop versions: 4.2.4-1 and 4.2.0-1. Downgrading qt6 back 6.4.0 ---> 6.3.2 solved problem.
/off my ancient 3 year old build of telegram-desktop9 v2.6.1 is still working fine :D but granted it's on qt5
I suppose because it uses qt5. :) `ldd /bin/telegram-desktop` Damn, I never read anything to the end.
Rechecked now (upgraded to qt6), all good.