You can replicate this by getting lucky and hovering your mouse over a bull, but the easiest way is tracking it down using the new hunting skill and then putting your mouse on top of it. You won't be able to see it, it will run away from you and behave just like it did before, when I could see it. It wasn't just on my end, I had a friend who had the same issue as I did.
Screenshot proof:
You can still tame it, hit it, it will hit you when it is almost dead, etc.