Comment 4 for bug 896013

I have noticed some peculiarities regarding hovering units if they are lifted into the air higher than 200 or so leptons (the point where it is considered targetable by AA weapons), primarily the potential loss of movement (although this occurs at random and is hard to reproduce) and the occupation of all cells it travels over whilst in the air... meaning that every cell it travels over is then considered to be occupied by a vehicle on the ground, meaning you can't build on or move through it.

Interestingly enough, you can play snake with this hovering unit and trap itself in its own "occupied" cells, as it does not ignore the rules of normal ground locomotion whilst in the air.

This could all be the result of an issue unrelated to this one, but suffice it to say, lifting hovering units causes bugs.