Same bug but only with my first psyker. I can play with the other characters. It happened first when I get a new forc staff and equiped it. The staff does not appears on the character selection screen, the psyker seems unarmed.

I seems that surrendering cause the game to crash each time I try to play again.

Same problem here.  Had a couple disappearing items issues (usually pistol/rod, happens when loading into mission), but I didn't have to quit the game, as I still had a staff equipped.  Last night, I had an issue where my armour disappeared, so I surrendered the mission to find out what was going on.  Game crashed.  Attempted to reload character, game crashed again.

Character is now unplayable.