Reminder that does not disappear after dismissing it

I’m using version 9.2.2157 (5b49542) with Windows 11 and a Google Workspace account. I’ve been using it for long and it works well. Except in the last 2 weeks, the reminder of one event is not disappearing even after dismissing it. The reminder, after dismissing it, disappears for 1-2 seconds, but it returns blinking a couple of times. Very annoying.

Any suggestion?