Ok, so this is very minor in my opinion, but I think some of the more clever minds here can find creative uses or actual cause for this.
In ashran using the Tablet of Ghost Wolf, if your invis and run through a hunters AOE slow trap (think its frost trap) you will get the debuff like normal, however the debuff seems to stay on you even after exiting the trap AOE. The only way I could remove the debuff was to use a trinket or have it cleansed off. Not sure if the area matters, but seemed to happen the most while we pushed the road on the horde side.
I am not sure if there is more to this or not, but just an interesting thing I found the past few days.