Old Tags Reappeared

1password for Mac version: 8.12.10, MacOS 16.4.1

Opened 1password on MacOS today, and suddenly about 20 tags that I had previously deleted reappeared (each showing "You dont have any items with this tag". No entries seem to have been lost or corrupted (as far as I can tell), but it's pretty worrying having something like this happen.

Is this a known issue? The tags have also reappeared on my other devices (iPhone etc).