Entire inventory duplicated when player combat logs on phantoms

If the player logs out while targeted by phantoms, he may be killed while logged out.

When the player logs back in, he will still be alive, but will pick up the items he would have dropped if he had died. (Other players will observe his death and the dropped items.) Consequently his entire inventory will be duplicated.

[00:06:22] [Server thread/INFO]: totemo lost connection: Disconnected
[00:06:22] [Server thread/INFO]: totemo left the game
[00:06:29] [Server thread/INFO]: totemo was slain by Phantom

Steps to duplicate:

• Unsure if essential, but another player was logged on in the same area to ensure chunks stayed loaded.
• Victim must not sleep so phantoms spawn.
• Survival mode, night time, hard difficulty.
• Allow the player to be hurt by phantoms.
• Log out before death (1/2 heart health in example console transcript above).
• Log back in and discover items duplicated.

This issue has been observed by 2 others on a pre-release server. If I recall correctly, it was also observed in -pre1.