Happened when moving towards the first quest area after establishing the garrison. As soon as the zone changes.
I’ve had it happen twice, on a mage and a monk. The mage managed to get out of it by spamming blink the second the load screen finished, but the monk is now deadlocked 
This problem has been around for a while, I had it happen to me on Alliance Druid. I managed to get out of it by using the “unstuck” function in the Blizzard help section. This will place your character in a safe place, so you can log on without being disconnected.
If that works for you, don’t go that way out of your garrison again. You can go to the coast and do the quests, but you have to go a roundabout way to avoid the glitch. If you have flying for example, fly out over the sea and approach the strand from the water. Or on land but just go a longer way around, and avoid the path with the glitch.