Rotating non-hexagon map counter-clockwise causes weird stuff

[jumbocarrot0]

This issue comes up for non-standard map shapes, namely 2-player and 3-player maps. The bug causes whatever is on a specific tile in the top-right quadrant to become duplicated on rotation. It's hard to describe, but the images below shows the issue:

(Starting map)

(Map after one rotating counter-clockwise)

From limited testing it seems to have to do with a specific tile on the top right:

(Starting map) (After one rotation) (After two rotations)

From what I could gather it only happens with a counter-clockwise rotation, never a clockwise one. I'll dig into this more if I get the time.