I completed normal mode and started messing around with the random shapes, and despite the shape being the correct orientation it was not accepted by the vortex. This happened for two separate shapes.
I checked the codes and they were different (Ru----Su rather than --SuRu-- I believe) so I went to the belt producing it and rotated it 360 degrees, which was producing the correct code. I put that on a single straight belt to another platform, and it had changed the code again on the other side to Ru----Su.
Attached is the viewer for the operator shape and the one I was delivering, showing they were in the same orientation and did indeed match.
I scrapped the factory and rebuilt it again, and the same result happened.
Game version: windows, Supporter Edition 0.0.9-rc7