It is possible to assign actor references in the BP editor on Scene Capture Components (Update Hidden/Show Only Actor Array)

The scene capture components (both 2D and Cube) in an actor blueprint wont populate the hidden OR Show only actor array after you have chosen an actor. The field remains as "none" however the component behaves as if the actor has been added.

1. Open any project
2. Add Default Blueprint Actor in content browser and open
3. Add a scene capture 2D (Or Cube) component
4. Find the hidden actors section in the component settings and add an element
5. Assign any mesh in the scene to the element

RESULT
The array element remains empty however the scene capture will still hide the actor.

EXPECTED
The selected actor populates the array element and is hidden from the scene capture.