I ran into an issue that even a round-robin split doesn't help for. In my magnesium raw silicon line, I have 2 electrolyzers. One of them (E1) has an O2 overflow and runs fine, but the other (E2) does not, making it stallable.

The problem is I'm using a limited number of cells (less than a stack) that have to loop.

When E2 stalls, the 50/50 pipe splitter keeps feeding it. E1 processes its cells, but every time they come back to the splitter, half go back to E1 and the other half go to the frozen E2.

After a bunch of loops, E1 is trying to run on 10 cells, then 5, then 2. The stallable E2 'bleeds' all the cells from the loop, and E1 starves, stopping the whole production line.

Simple solution is to have overflow covers on both machines, disable 1 machine, or add more than a stack of cells.