Found a weird bug, at least pretty sure i probably did :)
Converging conveyors identically in different directons gives different results (same while using sorters, even)
If it's not "a bug :)" then elaborate on why???
It is probably order in which items move from "new crossings". If I remember correctly, it was top->right->bottom->left.In mirror setups "first" item probably just goes through a different "exit".