Issue description: "Multicore/spreaded" autocrafting only using one machine

What happens: Only one machine is being used, despite haing multiple machines with same processing pattern installed in appropriate crafter

What you expected to happen: All machines spread the workload between the crafting of the requested item

Steps to reproduce:

1. Set up a few solderers with crafters ontop and importers at bottom
2. Insert the EXACT similar processing patterns into the crafters
3. Request the item from autocrafting and expect only one machine being used.
   ...

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.12.2
• Forge: 2601
• Refined Storage: 1.5.31

Does this issue occur on a server?
I don't know. Maybe irrelevant

P.S: I also made a bad quality video, showcasing the bug.
https://youtu.be/x0ayNR5WzP0 Maybe that would be helpful

I think this is not the bug, but it just don't work like that, sadly. It would be great if it would tho.

It should work like that. I'm going to look into it.

I can't reproduce this. It works fine for me.