Zombie message won't go away from MapShare page

When I was testing out my inReach Mini 2 and MapShare page before a trip, I sent a check-in message "to mapshare" and it appeared on the sidewalk where I did the test.

Even after I deleted the message and adjusted the visibility timestamp for my MapShare, this lone check-in message continues to appear and seems to cause the MapShare page to zoom by default to this location near my home. I can't figure out what else I can do to purge it. Edit: it shows on the map while the "messages" section indicates zero messages.

During the trip, I did several tracking sessions which appeared as intended on the MapShare. I have since deleted them in my Explore map collection, and they disappeared in MapShare too. Edit 2: the check-in timetamp is also earlier than the time cutoff I set on my MapShare settings.

I am not sure I sent any actual messages during the trip, so that zombie message might be the "most recent" I ever did. I'm not sure.

Has anybody else seen this behavior?  I want to clear the slate so there is no personal location content in the page until my next trip. And I'd want it to zoom to whatever wilderness routes I decided to share for that trip, not to this location near my home!