Every time i try to convert a save world the game syncs my profile info and fails every single time at 12%. I tried to convert a smaller world and this time it didnt required to sync but crashed at the middle of the conversion.

This happens every time with the same world saves.

Additional information:
The world saves are from 2012 (beta 1.6)

Video proof of the errors i mentioned:
https://www.youtube.com/watch?v=3VsuRowOxzs