Why are PCGs duplicating randomly, and how to fix this?

Hello, the engine is doing weird things with PCGs when they are duplicated from within the world, and has been doing so since forever.

This usually is a single actor that initially bugged out and then causes all copies of it to duplicate itself.

How do I fix this? (EDIT: resolved by replacing the actor with itself, but without properties, then changing the PCG back to what it was.)

Do I really have to delete all of them and find the “bugged out one”?

See, if I take an “unbugged one” and duplicate it, it doesnt create a “shadow copy”, unlike the bugged one (red arrow) - this has been happening since PCG was initially added to the engine, and never resolved.