I put stuff into vanilla enderchest, i resync to my "clone", open the chest and it's empty.
When i re-sync back to "original" all contents is there.

Hi sorry to get back in here so late, but better now then never. This bug is still not fixed, still the same problem :(

Hmmm.... Since The Enderchest is bound to your 'soul' rather than to your body, that should be synchronized, then it'd be a nice inventory accessible to every shell.

Should be fixed in Version 2.1.0. Please let me know if it still isn't.