Several people seem to have observed this. I think it is more likely to happen if you have not put wax (burr comb, or melted wax) onto the plastic frames. They don’t really smell like a hive to bees, as there are no bee pheromones on them. If you just splodge a few blobs of burr comb from an inspection onto the Flow frame faces, it encourages the bees to treat them like part of the hive.
Carniolan bees are also known as Swarmiolans. 
However, it looks like Russians and Africans are very swarmy too: