Found a major bug! If you only synchronize Enderchest, before the A server restarts, put the items in Enderchest, then cross-server to B server, take the Enderchest items out to the B server backpack, and then return to the A server to wait for the restart, and wait for it to exit Upon entering the B server, the items in the backpack exist. The items taken out after opening Enderchest have been copied.
Found a major bug! If you only synchronize Enderchest, before the A server restarts, put the items in Enderchest, then cross-server to B server, take the Enderchest items out to the B server backpack, and then return to the A server to wait for the restart, and wait for it to exit Upon entering the B server, the items in the backpack exist. The items taken out after opening Enderchest have been copied.