Using the "Select Actors using this Asset" option in ActionRPG causes the InstancedFoilageActor to be selected incorrectly for many assets. It seems to occur with any assets that are being referenced by the level, such as the GameMode and Pawn.
Regression?:
No, this occurs in 4.20
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-68954 in the post.