There’s a massive bug with rez: The souls of her allies no longer appear in front of her, so she has no indication of whether or not she can fly/rez an ally, unless they’ve died on top of her.
Okay, maybe unplayable is exaggeration, but seriously, c’mon. You leave the thing that changed little out, but let something like this slip in?
Please patch asap. And consider that Mercy bug as a small buff, toning it down slightly.