How to handle [serializeReference] in a list? (Custom inspector)

This is way too much code.

For one PropertyDrawers need to be stateless, as they are reused for multiple fields. That’s probably where the issue is.

Secondly, you can auto-draw a serialised property with a PropertyField so there’s no need to handle that yourself.

Here’s my basic general solution using UI Toolkit: abstract SkillList that can be edited in Inspector - #15 by spiney199