From the upstream bug report (https://bugzilla.mozilla.org/show_bug.cgi?id=1724656), I tested rather extensively in a Fedora 33 VM and wasn't able to reproduce the issue, so there seems to be something that's specific to Ubuntu in this problem (maybe the version of dash-to-dock?).
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1932328 Title: Thunderbird under Wayland does not correctly close (or manage) windows To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1932328/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
