Calendar popups often blank
After I snooze or dismiss a calendar popup (usually from my Google calendar that I have integrated into Thunderbird) the same popup window stays up, but completely blank.
Other times, a blank calendar popup just appears. I think that may be what ought to be the snoozed popups after the snooze period.
How to fix? Thanks.
P.S. I asked ChatGPT this and it gave me some suggestions which either didn't fix it or sounded too scary to try.