It’s hard to say if this is a bug or if Blizzard just found the Tracer too defiant.
Blizzard has had to change Tracer before. In the past, the pose of the heroine has been replaced with a completely different one. Recall that it originally looked like this:
Gamers realized that Blizzard was once again working on the “back” of The Tracer.
What does Tracer look like today?
It looks a bit as if someone has made a mistake somewhere. It’s possible this is some sort of visual glitch, but it’s not looking very good so far – at least in terms of what Tracer used to look like.
It is possible that this will be corrected, although Blizzard itself has not yet commented on this. Of course, this is not the most important issue, but interestingly, it evokes very extreme emotions.