I just created a Shield Dwarf (female ranger) the combat log from the initial imps reads:
* Imp cast Fiery Bolt on Karen.
* A missle from Imp missed Karen.
and a little bit later they actually did hit her with Fiery Bolt for 2 Fire Damage.
So I didn't encounter this bug in the tutorial.
Before anyone asks.. no Karen doesn't care about her brain bug. She's on an epic quest to find.. and complain to... the manager.