Hello. The latest version (and the version before that, 9.30 and 9.31) has incompatibilities with EV Refining. I downgraded to .27 and it was solved. Gives an error about furnaces (there was a thread about it, before mine). Still, your mod is perfect, and i thank you for that!
I don't know if it is hard to fix, so i wish you luck and a happy week.

Thank you for the additional info, was able to locate the issue after knowing which mod causes the issue. It's a very annoying set of circumstances; EV Refining turns every furnace from a furnace type to an assembling-machine type entity, which messes with the detection logic being used by this mod, running during final-fixes, which (depending on the load order) happens exactly in between when I create the mini furnace, and when I need to check for the mini furnace, which is no longer a furnace type entity.

There is technically a reason for it, since they have a coal furnace recipe added, that would start cooking the fuel when there's an input shortage. There's probably a better solution to this problem, like.. adding an intermediate crafting recipe to turn the coal into an item that can be cooked in a furnace, but that's just my opinion.

Should be fixed in v9.3.2

That is nice to hear, thank you for fixing it so quickly. I've posted it on the micro machines thread, but it also has the same problem regarding the intermediary.