1. Place a rotator with the arrow facing the blank side of any rail
2. Place a docked entity on the rotator
3. Try to rotate the docked entity
4. Observe its resistance to rotateany rail with a flat surface in the arrow direction of a rotator prevents the rotation from taking place
{F26337}
build something like this or use the provided blueprint to see the problem https://phab.starma.de/F26285