Practically the title says it all, this is a little bug, but it is there. Want to test it out? Go and create a new world give yourself some xp and then do /kill, you will see that the experience orbs will follow you even though you are dead.
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Can't reproduce in 18w30b, singleplayer. The XP-Orbs just sit directly on top of the deathpoint, not scattered around over several blocks. Can't test in Multiplayer, unfortunately.
Can confirm for MC 1.12.1.