Death while in tree form
 

Dying while in tree form generates a human male corpse (this part is not a problem, although it'd be nice if it was reverted the casters natural race. we don't want treeform corpses everywhere again) and places the corpse just below ground level. It can be summoned and moved as normal, but not looted, until you drag it to a ledge or exposed hill or some such so you can reach it at it's subteranean depth.

A minor bug but annoying. Sure it doesn't affect people too often.

try the command /loot it should work just like you can /target character's corpse and /corpse even though you can't see it.

After more testing it seems that this is the actual location of the PC for collision and line of sight detection. After getting stunned, the first person vision drops to about a foot below the floor, just like the corpse. When targeting spells, anything that's not a flat terrain object (the ground) will produce the "you can't see your target" response.