[2.0.16] Inconsistent recycle times for recipes that yield multiple items

[evilbrain]

1. What did you do?
   Put concrete in a recycler (normal quality recycler, no modules, no beacons, normal quality concrete)
2. What happened?
   It recycled 0.8 items per second
3. What did you expect to happen instead?
   I expected it to recycle 8 items per second.
   Base recycling time should be craft_time/16/items_per_craft, however items_per_craft seems to be missing from the formula. So far concrete is the biggest offender, but it's consistent with other items like iron sticks and copper cable.
   I am speculating, but it looks like an oversight. Or is this intended behavior?
4. Does it happen always, once, or sometimes?
   Always