I noticed several flying dead players all over the south / east coast on every experimental servers.
When a player logs off while passed out, there is a chance that his body remains standing. sometimes they even move their heads towards you and go prone when aimed at. but are defenetly dead! lootable but not possible to hide. when tryn to interact with them (bandaging etc.) it says: "bandaging unknown entity"
some of them start flyn after several hours without server restart (and experimental servers seem to be without a restart for ~ 14 days)