Spectator Pawn cannot be added to level by dragging into viewport

Spectator Pawn cannot be added to level by dragging into viewport but can be added by using place actor in the level viewport.

Regression:
This issue occurs in 4.13.2, 4.14.3, and 4.15.1 of the Binary build versions

1. Create a new project (No template or starter Content Needed)
2. Create a new blueprint of type Spectator Pawn > Name it Spec_BP
3. Click to highlight Spec_BP and right click the level view-port and select place actor
4. In place actor add Spec_BP (Expected result)
5. Click and Drag Spec_BP into the level view-port

Result: The Spectator pawn is not added to the level
Expected result: The Spectator pawn is added to the level