I've noticed health regen behaves differently with AppleCore installed on 1.9.4. Specifically, it seems like the old style of regen, instead of what vanilla does now: rapid regen when the player has saturation. I'm guessing this is unintended?

Yes, definitely unintended. Didn't realize that changed, thanks for the heads up.

Should be fixed, will release a new version officially tomorrow most likely. You can test it by downloading the latest build here if you want: https://drone.io/github.com/squeek502/AppleCore/files

Released: https://github.com/squeek502/AppleCore/releases/tag/v1.3.3