Adding Map Input to DirectorBlueprint Fails

I need to add a map to a DirectorBlueprint (String, String).

Ways to replicate:

  1. Go to Level Sequence
  2. Add TriggerEvent
  3. Create an Endpoint to that SequenceEvent
  4. Add a (String, String) input map to the SequenceEvent
  5. Compile

This will give the error, without the need of wiring.

I saw that people use the workaround with changing the variable/map value type to integer or something else. However, this does not solve the problem.