Just had a check into this and can confirm the hotfix is in place and has fixed the issue. However you need to complete the previous Chamber of the Heart questline. I’d double check your map for Mount Hyjal as you should see a marker there for where to go!
Fulzam, if you’ve followed the recommendations from above (check if you have completed the previous Heart questlines, for example) but still need help please consider creating your own thread.