It's self explanatory. Whether you kill the player with a melee or a long ranged gun gives the same results.
The bug occurres every eight out of 10 kills (8/10 times) which is about 70-80%. of all the kills that I've made over the past couple of days.
If I hit the player and he is unconscious, his body is still visible. The second after he dies his body disappears and cant be found using the Z (lie down) and TAB technique to search for his items.
Also if a player dies in a house, his body is visible but you can't loot it with "TAB". The only possible interaction with the body is "Check pulse"
If he dies near stairs on the second floor of a house, you can go downstairs and spam "tab" and occasionally his items will appear 1-2 meters below his body.
Most of the times, even in house the body disappears.