I have managed to reproduce the issue with the upstream build for 78.13.0, downloaded from thunderbird.net, in a fully up-to-date hirsute VM, executed with MOZ_ENABLE_WAYLAND=1.
This rules out a packaging problem.
I have managed to reproduce the issue with the upstream build for 78.13.0, downloaded from thunderbird.net, in a fully up-to-date hirsute VM, executed with MOZ_ENABLE_ WAYLAND= 1.
This rules out a packaging problem.