Since we started using the latest 2018.2 (we were on 18.1 before) release we are seeing the following issue. Have a serialized UnityEvent and check the visualization in the inspector without odin - an object to assign and some dropdown boxes to select the method. Now activate odin and you'll see more some internal serialization structure, see screenshot. It makes it hard for designers to work with UnityEvents and we don't want to disable odin for all classes using UnityEvents. Before 2018.2 it worked flawlessly. we have this issue on two different projects.
Issue #365 resolved