Use SetActorLocation() for elements in OnConstruction()

I would suggest using local transform using SetRelativeLocation or AddRelativeLocation. It should behave the same and can be visualized inside blueprints too.

// Set relative location and scale instead of world
			smc->SetRelativeLocation(FVector(0, PillarGap * i, 0));
			smc->SetRelativeScale3D(FVector(1, 1, FMath::RandRange(PillarHeightMin, PillarHeightMax)));