Hello,
I've sent an hero (let's call him A ) to do the quest "The Heirloom", but this hero was killed while trying.
Si I've sent another hero (let's call him B ) to do the quest in question.
This time, Hero B succeeded the quest... but then the XP where given to Hero A ! (I know that cause I got the screen saying that I had to choose if I wanted Hero A to be Assassin, Defender, or Mage, and so on (the screen you got when passing from lev 1 to lev 2).
So, it seems the XP allocation is not made to the right Hero.
PS : This time I have started the game from a former save, so I'm really in 0.92.