I sometimes get actions that are missing fields. No matter what I do, certain gameobjects will always display the same actions with missing fields. My current workaround is:
1. Create a new empty object, and add an FSM with an empty state
2. Drag the desired action from the action menu into this new state
3. Put something (anything) in each field on the action
4. Copy the action from the state
5. Paste it onto your desired game object, you should notice that the actions are all there - just change the fields to what you need.
Hope this works!
