Fake players duplication in player lists

[Youmiel]

Fake players exists as a "ghost" in player lists(tab lists) some hours after I issued command /player [player name] kill or just kill the fake players . They only exists in player lists but not in game, If we try to use /player [player name] kill, the command will return "Only fake players can be killed" message. And all commands which need an argument reference to this fake player will return "Player not online" message. However, /player [the same name as ghost player] spawn can be executed successfully. After this, try command /list, the fake player's name exists twice in player lists.

How can we reproduce it?

1. Try /player [name] spawn, for example /player Steve spawn
2. Kill the fake player with any method (except instant health 125 potion)
3. Wait for fake players reappear in player list

Expected behaviour
Fake players shouldn't reappear in player list after death or being kicked by command. It is even unacceptable for two or more "ghosts" of fake players with the same name exist in player list.

Screenshots

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[ishland]

See #8