3:04 PM, Wednesday February 24th 2021
I think you're absolutely right. The top face is supposed to get significantly more shortened after a second rotation. Look at this gif of a rotating box . Upon paying close attention you can see the same happening to this box here. The transition happens in 3 steps (not including 0 degrees and 90). There is alot of difference between the forshortening in the 1st and 3rd step.