Okay so I have found a bug that allows you to create more than a single node for events. I was actually hoping this was allowed and the copies of the events would be ticked sequentially but thats something else.
Reproduction Steps
- Create a new blueprint extending actor
- Place an event node
- RMB copy event node (or duplicate)
- RMB paste (if not duplicated)
You should now have a copy of the event which will give you a compile error stating that the event node is out of date.