I'm having issues where if I rotate the model along the Z-axis with supports, being the only rotation that doesn't remove them, I will no longer be able to modify or add any working supports. Each of my already placed supports attempt to jump back to their original location prior to the rotation, no longer having a proper connection to the model.

This bug occurs on both the stable 1.6.3 version, and Beta 1.6.4.3.