This isn't a bug, per se. It is more of what seems like an oversight. In the online reference, it states that this building smelts regolith, charcoal, and ROBOTS into oil and consumes food as a utility. This is reinforced in game, where it shows robot, charcoal, and regolith consumption at even levels while food is at its own. All the other buildings which use robots during production, like the plastic or triantanium producers, consume robots as a utility. Since this makes the advanced oil lab have a high robot consumption, it is almost unusable earlier on. I feel like this building is an inconsistency.