There is a bug that randomly occurs (Still trying to find the cause) in which enderchests aren't loaded on join. The bug for now has been "fixed" by loading the enderchests sync if they weren't loaded async on join. This is a temporary solution as I investigate the bug.

A new experimental converter has been added to convert data from SQLite to MySQL. It can be used by running enderchestconvert
SQLiteMySQLConverter via console.