This Morning I took a flight path that went through the tunnel from Dornagal to Ringing Deeps, half way through the mount just stopped mid air. After removing addons and restarting multiple times I was forced to use the unstuck option.
Following this I chose to manually fly through the tunnel, once I reached the Ringing Deeps there was no visual map just blank and I was disconnected. Now everytime I log I am instantly disconnected and I am unable to use Unstuck again for a few hours.
You will need to make a ticket to get a GM to move you somewhere safe and I’d avoid flying down for the time being. Try going another way. Like use the teleport to Azj then the FP.
this once happend to me but in Dreanor. when i flew to a specific zone i dc’d and couldnt log. after about a day i cold go there again. but as puny said, make a ticket, they will sort you out 
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So I waited out the unstuck timer and became unstuck. Out of curiosity I entered the tunnel cautiously, there is no change I am at the bottom of the tunnel and there is nothing there. Its very frustrating frustrating, I have to traverse through Azh Kahet to get anywhere.
Hey Tummytickle,
I’m not seeing any issue with the tunnel from Dornagal to the Ringing Deeps, and I’ve no issue going there.
If you’ve recently left a Delve, we’ve seen reports of players getting desync’d after leaving one. Disconnecting and reconnecting should generally solve this issue.
As for your character, if it’s still stuck, please do try the unstuck character tool on the site.
Hope this helps. 
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Yeah stop using Three Dimensional Bioprinter as a Utility Curio for Bran as something sticks around and causes you to not leave the delve (on a technical level) and you’ll be unable to teleport or change map anywhere until reopening the game.
Is happening to me too. It’s reported on US forums too: https://us.forums.blizzard.com/en/wow/t/stuck-on-flight-path-dornogal-down-the-tunnel-to-the-rings-deep/2122922/7