In Editor, When you remove a return value parameter from a Blueprint Interface function's Output Category. (so there are no return values), it becomes an event.
In any Blueprint that implements the function, it will warn you that the function needs to be removed and you must add an event instead, However, you can not remove the implemented function. Neither the delete key or right click > delete will remove it.
This is a Regression as this does not happen in UE 4.22
Result: Unable to delete the implemented interface function from the Actor Blueprint.
Expected: You should be able to delete the implemented function.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-85687 in the post.