I think this WAS bugged in the original as well.
It was in fact bugged for a time in original. There was a hotfix announced on February 23, 2008 that fixed a bug causing Mother Shahraz to parry haste when this behavior was not intended.https://www.bluetracker.gg/wow/topic/us-en/4823644205-nalorakk-and-mother-shahraz-parry-fix/https://web.archive.org/web/20080226191454/http://forums.worldofwarcraft.com/thread.html?topicId=4823644205&sid=1&pageNo=1
So they left it bugged so they could hotfit it just like classic?ahhh idiots, wish they'd give us dual spec.. its really a pain atm without it.