I recently updated to Drupal 8.6.2 and Paragraphs 8.x-1.3.
I have a content type with a Paragraphs field. When I try to update an existing node I get the following error message:
The referenced entity (user: 21) does not exist.
- The existing paragraphs do not reference users directly.
- User 21 does not exist.
- User 21 is not the node author.
- I can only update the node if delete all of the paragraphs, of every type.
- There are no pending db updates or entity updates.
My feeling is that something didn't update correctly, but I'm not sure how to check / rerun the updates. (There were a number of updates to be run when I deployed the 8.6.2 update.)
UPDATE: I rolled back to the previous release and DB state, and I still get the error (which no one noticed), so it is not related to the update.
UPDATE 2: Ticket on drupal.org