I believe I'm experiencing the same bug. It's more egregious on Wayland because messages appear in the middle of the screen rather than at the designated edge. It looks like this (email address intentionally blurred):
** Attachment added: "thunderbird-nonnative.png" https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/2056481/+attachment/5754809/+files/thunderbird-nonnative.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2056481 Title: [snap] Thunderbird does not support native notifications on KDE Plasma Desktop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/2056481/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs