I don’t know if this is a bug, and I don’t know how to reproduce it, but don’t know where else to put a heads up that on my digital ocean docker version I clicked the upgrade.
It hung when it was going through the compression stage. When I returned to the dashboard it claimed that it was upgrading (but if it were, I wouldn’t be able to see the dashboard, right?). The warning message on the “Reset upgrade” didn’t make much sense to me and it wasn’t clear what that would do, so here’s what I did instead. (It worked!)
My fix was (as root)
cd /var/discourse/ ./launcher rebuild app
Now all seems fine.