I’ve gone through a bunch of troubleshooting steps since this first started occurring, but I can defnitively state that I did not delete any persistable data or change a weak_map or delete members from a persistent class prior to the issue first occurring.
Over the past 24 hours or so as I’ve been trying to troubleshoot, I HAVE read everything I could find on the forums and various searches, and some of those results suggested adding a weak_map for persistence data. So I did try that at one point, and also tried deleting the data from the Content Service as suggested in this post: https://forums.unrealengine.com/t/verse-persistence-incompatible-without-editing-the-verse-file-that-contains-it/1956674/2
That didn’t seem to make any difference, though. I’ve pushed well over a dozen versions all with the same result.