Chaos Trial specific monster bug

I run lvl 80 chaos trials A LOT as my main source of income fpr background info. All monsters ignore you before you are in the trial area since the last patch EXCEPT when a stoneclad gorilla is rare. EVERY rare version of the stoneclad gorilla has ALWAYS started attacking me before i get into the fighting area. I have died a few times from it diving me as Im going down the lift into the area for the first time. It is only when the stoneclad gorilla is in its rare version. The regular or magic versions do not do this and it is ONLY the stoneclad gorilla that does this. Other rares do not do this that I have seen.