Constraint warning in ElementalDemo when exiting PIE

Following warnings are showing in the Message Log after PIE:

Warning Constraint SingleAnimSkeletalActor_7 attempting to create a joint between two actors in different scenes. No joint created.

Warning Constraint SingleAnimSkeletalActor_7 attempting to create a joint between two actors in different scenes. No joint created.

1. Open ElementalDemo in the editor
2. PIE and let the cinematic finish
3. Exit PIE

Result: Warnings are shown in the message log