This is a bug that involves extracting items from IC2 machines/ immibis' advanced machines with multiple output slots (e.g. Thermal Washer from Advanced Machines, Thermal Centrifiuge and Induction Furnace from IC2 experimental). The bug occurs when an item is inputted to the machine, but the machine cannot process it because there are other items in the output slot, e.g. copper dust and iron ore are in the input of an induction furnace, but they cannot be processed because gold ingots and copper ingots are already in the output. The gold and copper should just be extracted by the interface pipe, but in this instance where the machine is waiting for the output to clear, no items are extracted. The machine then stays in this state as no items are being removed from the machine due to the bug.

I'm not sure if this also occurs with other machines, and machines from other mods.

Just have an extractor chip in the interface pipe, it will take care of it. I can't see why this would be an issue.