One player on our server is repeatedly having their Enderchest items vanish completely.  This has been verified to be the truth.  It happens fairly consistently, usually they'll place items in, log out, then next time they log in the items will be gone.  I've checked their playerdata file and the enderitems field is completely blank in NBTExplorer.  It's only happening to this one player, though on a few occasions people (including myself) have had their enderchests swapped with other peoples' enderchests.

We're not running any plugins that interact with enderchests.  Our plugin list is as follows: ChatEx, PermissionsEx, CoreProtect, InvRestore2, Essentials, DiscordSRV, and Holgraphic Displays.