The most well known example would probably be Princess in Mara. Now, this isn’t known to be a mob with windfury mechanics, but it is common knowledge that after kiting her she will usually 5 hit you when you get back in range, resulting in a 1 shot for anyone below 2k hp.
This could be a change to discourage farming, but it doesn’t work anyways so I don’t know why it’s in the game. Additionally, if this isn’t a vanilla ability it is a bug for her to have that mechanic, intended or not. Any mechanic not specifically put in the original game needs to be clearly announced and explained as to why it’s necessary.
No changes.
Edit: by the very nature of the fight, even if she did have a windfury mechanic, she’s bugged because the fight involves her not being able to attack or be attacked for a period of time. If the mechanic is indeed intended, it’s being abused by the mob
Edit edit: I have confirmed Princess has no windfury mechanics and therefore she is bugged and all the other reports we have are valid