Holy hell. I just got the update myself on my iPhone like 15 - 20 minutes ago. I’ve been waiting for an update for a good while now, so thanks for bringing that up.
About your issue: I’m not running into the issue on iOS 13.3 on my iPhone XR, so I can’t see what’s going on my end with that. I have been running into other issues on and off again that were sync related on it (like several other people). Search for iOS sync and you’ll see what I mean.
Do you have Joplin on multiple platforms, such as on the Desktop or another mobile device? I’m asking because, as long as everything is synced great between the platforms and no issues are arising otherwise, I would highly recommend Uninstalling Joplin from your iPad and then reinstalling and resetting everything up. It’s a bit annoying and can be a time sink if you have a large amount of notes / images on the app, but it seems to be the best way to solve the problem for the time being while the devs work out the kinks.
If you have anymore questions, feel free to ask.