Twice now (on an older version and after the most recent update), I have loaded my world (offline/totally private) after having left it in a safe environment with no possible way of dying only to have the "you died" message appear as soon as the world loads in, immediately as it loads, no time to move or anything. Regardless of whether I choose continue or quit to menu, when I return to the world again and go back to where I "died" everything in my inventory and all the experience has all disappeared (it took 30 seconds to get back there after the last "death" so couldn't have just de-spawned.

If I can provide any extra info let me know, tempted not to play again after the amount of valuable/time intensive stuff I've lost to this bug sadly. 

Hope some of this helps.