I can reproduce this in deb packaged Thunderbird, so this is an upstream problem. Would you like to file the bug report there[1]?
[1]https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2137539 Title: [snap] thunderbird -compose marks PGP key as invalid that works fine with application started To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/2137539/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
