Have same problem. I lost near 3 hour session. My saves show correct date and place, but then i try load game start in wrong place and this wrong game progress. I look through all my saves and don`t see save that corresponding loaded location.
--Use Steam version of game, but logging this MC account.
--Play in single player world
Start playthrough on beta branch and now play on actual version of game (0.13.2.3743 rel).
Some time i lost connections for MC account and need login again. Then current problem occurred i lost connection too.
PS Cant send saves cuz file too big)