Upgraded. pre-existing calendar events shifted from local time to UTC

Very weird. I’ve now seen a variety of cases:

  1. As another user, the event visited shows local time.
  2. As admin, an event was UTC. Refreshed. Event updated to local time.
  3. As admin, chose another event. Local time shown.
  4. As admin, that Dec 22 event still showing as UTC.
  5. As another user, that Dec 22 event displaying as local time.

I’m glad I have a screenshot or I’d think I was going crazy.