I have 3 input lines and 1 output line at a conveyor rail junction. Input 1 (top) alternates, input 2 (right) is blocked, and input 3 (bottom) has nothing in it. This results in the output (left) only working at 50% capacity. If this operated like liquid or gas pipes, the 3 inputs would alternate - and since the third input is empty the result would be inputs 1 and 2 alternate and output would be 100% utilized.
I have also taken a short video to show the behavior in motion.
Note that before I filled the upper line with material, the right line was alternating even though the upper and lower inputs were empty.
Steps to Reproduce
Build a 3 input, 1 output junction with conveyor rails. Provide material on 2 of the inputs, watch one input alternate, the second input block, and the output only operate at 50% capacity.
This issue has not been confirmed by a developer yet.