Dragging belt through splitter if there is already belt in the same direction causes a underground to be placed if the belt is on the other side of the splitter.
The new bet is facing the same direction as splitter and existing belt.
See attached video, row 4 and 5 (count from 1 on top).
I would expect the behavior to be consistent across all the cases.
https://youtu.be/LOXqngv30dw
[2.0.55] Smart belt creates unnecessary undergrounds
Re: [2.0.55] Smart belt creates unnecessary undergrounds
The bug is still present in 2.0.60