I was playing a base defense mission and had stunned a wraith elite. This wraith was killed several different times in different ways (through save scumming) while laying on the ground before I decided to pick the body up and place it into the inventory of one of my soldiers before moving him several tiles away back into cover which appeared to be much safer. This however was proven incorrect as immediately a shot from the crossfire had landed on the tile which the body had previously occupied, immediately teleporting the wraith out of my soldiers inventory back onto the ground before being killed by the shot that had put the body there in the first place. It is as if the wraith seems to be able to occupy two spaces at once, and upon being shot at decides that it would rather die, a quantum conundrum it would seem.
Although I hadn't targeted the tile itself, I was able to reload and repeat the glitch.
P.S. Targeting the tile I found that the game seems to think that the wraith is still standing there. Attacking the ground tile and attacking the wraith superposition both result in quantum suicide.