[REJECTED] Neltharion's Lair loading screen loop

[ropperogue]

WoW Freakz link: I couldn't find any links relevant to this bug

Bug description: I really didn't know where to post this bug as I don't see it having a place in any of the locations so I'm putting it here. I tried to find another bug matching this description but I failed so I'm creating a new thread. I hope that you can look into it because I would consider this bug completely game-breaking.
The bug happened when I entered Neltharion's Lair dungeon with some players from my guild. I completed that dungeon earlier that day on mythic difficulty with a level 11 keystone equipped and I wanted to help a friend from guild complete it with his level 2 keystone. The moment I entered the dungeon I got teleported to the place I was in when I used my hearthstone to leave the dungeon after completing it on level 11 difficulty. I then got a message on my screen telling me that I am not in that instance's group and that I will be teleported outside in 2 seconds. I got teleported out and immediately after the loading screen I got another loading screen teleporting me inside the dungeon to the same spot I was in a few moments ago. Then I got the same pop-up message and the same 2 loading screens back-to-back. The loop just continues from then on. The video proof is linked bellow.
I tried going to the wow-freakz site and using the unstuck option. I also tried deleting the cache folder. The last two things I tried doing was regrouping with my friends and reseting all instances. Nothing helped. I closed the game and my friends replaced me with another person from guild since then and I don't think I will be able to replicate the bug again. If the link doesn't work for whatever reason please let me know so I can re-post it and the devs can see it and try to fix the bug.
P.S. I would also like to note that I do have some addons installed but I don't believe that they are causing the bug to happen. The only addon I can think of causing the problem is BigWigs but I don't have the right conditions to try replicating the bug once I uninstall it so I'll leave that to you.

Proof: https://youtube.com/watch?v=hrgDfDfoZXY:

 

Staff message (LethalFactorLK):

 

unstuck character on site