I’m by the Nighthold raid entrance speaking to Khadgar about to finally finish Insurrection, and suddenly the entire floor disappears and my characer is running in place. I stopped myself with a blink, or so I thought. The game thinks I’m falling because the game says I’m moving whenever I try to hearth, teleport, or even log out.
Another player shortly came by and finished Insurrection, and I saw them also running in place. They just had the same thing happen to them that just happened to me.
Edit: thankfully, closing the game and logging back on put my character back on land and everything is back to normal.