Behaviour is as expected in the SkeletonAnimation
component. This only affects my custom scripts. These aren't new scripts though, they're the same as they used to be, it's just the inspector that isn't playing along. I'm in normal view in unity (not debug).
Everything compiles and looks normal, I'll try removing and replacing Spine runtimes in case something went wrong while i upgraded. Will report back.
[EDIT: Removing and reinstalling the spine runtimes didn't solve it]