very similar to other issues but you can dupe all the items you equip on yourself using matter overdrive.

steps to reproduce

1. turn yourself into a android and equip some basic parts (head, arm ect)
2. clone your self using sync
3. jump into your clone and unequip the android parts from clone
4. kill clone or jump back to your original body and profit $$$

sync version = Sync-1.12.2-7.1.0.jar
matteroverdrive version = MatterOverdrive-1.12.2-0.7.1.0-universal.jar
forge version = forge-14.23.5.2831

Can you try disabling transferPersistentItems in the sync config and see if the fixes the issue?