Issue still occurs (Jan 2020). This is unacceptable considering how many portals were removed in a patch this expac including ALL the portals to Hellfire Peninsula which previously existed in the mage trainer area of EVERY major vanilla capital city. I concur with the above poster. Not fixing things like this shows a real disregard for the player base. Farming to try and complete my looks collection is already painful enough with the amount of boring walking through raids I’ve done literally hundreds of times before on my account (mostly before looks collection was added) without the added annoyances of being unable to get around quickly because Blizzard either removed the portals or in this case just leaves them broken.
Steps taken that did NOT resolve this:
-Tried walking through on ground mount instead of flying in with flying mount
-Tried dismounting and walking through on foot
I still find myself sitting for a minute or two trying to figure out paths to places I would have been able to get to in my sleep (and quickly) before the portal removal and I guess I had better commit to memory never to try and use the old dark portal now too.