This sounds very much like bug #1945741, which was an upstream bug (https://bugzilla.mozilla.org/show_bug.cgi?id=1734428), but was marked as fixed 9 months ago. So it's probably a slightly different variation of that bug. Would you mind filing a new bug report at https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird, mentioning that other upstream bug, and sharing the link to it here?
This sounds very much like bug #1945741, which was an upstream bug (https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=1734428), but was marked as fixed 9 months ago. So it's probably a slightly different variation of that bug. Would you mind filing a new bug report at https:/ /bugzilla. mozilla. org/enter_ bug.cgi? product= Thunderbird, mentioning that other upstream bug, and sharing the link to it here?