[ghostofjfd]

I think I've found a way to blunder legally into an overstack. Say an armored unit or an Ogre has ended its movement phase safely in a mined hex. A friendly Ogre with M2 but within 6 tread unit losses of M1 wants to move through the hex and continue to an empty hex on the other side. It enters the hex, the mine goes off, and the tread losses knock the Ogre down to M1. It has already spent one movement point, so now it has to stop there (by analogy to 6.04). The Ogre or armor already there has expended all of its movement points, so it can't leave either. There you are with an overstacked hex at the end of the movement phase.