Years late to the party, but came across this in my digging. Here is the API Doc for AddActorLocalOffset for both v4.27 and v5.5
AddActorLocalOffset 4.27
AddActorLocalOffset 5.5
Unreal is encouraging devs to move everything to World space in the future. (hearsay, but I recall that local spaces will be deprecated in the future. Don’t quote me on that)
Anyway… here’s the API Doc for Add Actor World Offset as well, which indicates that “Only the root component is swept and checked for blocking collision, child components move without sweeping. If collision is off, this has no effect.”