Can't access Actor in Sublevel from Persistent Level Blueprint

You are unable to access or create references to any Sublevel Actors in the Persistent Level Blueprint. Licensee reports being able to select the Sublevel Actor and then right-click to create a reference to it in the Persistent Level's Blueprint.

I have tested and reproduced this in 4.19.2 (CL-4033788), 4.20.3 (CL-4369336),
4.21 (CL-4472090), and Main 4.22 (CL-4476447)

1. Open the UE4 Editor and create a Blank project
2. Save the default Level that is opened up
3. Create a new Default Level and add the previous Level as a Sublevel
4. Select the floor in the Sublevel
5. Open up the Level Blueprint for the Persistent Level and right-click to add a reference to Floor

Results: Can't add reference to Actor in Sublevel

Expected: Able to add a reference to the Sublevel Actor