I've noticed that inefficient harvester turrets when multi-tooled off come back as tool turrets. I don't know if this is a bug or intentional, but I don't think it's good, whatever the reason, as it severely limits the players options in breaking into rich asteroid mining. I've checked both the inefficient harvesters on zirax mining rigs as well as colonist light ice miners, and both just give back tool turrets. I think in general it is a bit flawed to be forced to be friendly to polaris/colonists to break into a central technological tree without some luck in random schematics in the first place, and not having an alternative through inefficient harvesters makes that issue much worse in my opinion.