I had just relogged onto PvE and was running around an island near the wind wall, and the ground quite literally vanished from under my feet and I plunged into the void. I had to forcefully respawn to get out of the situation.
I’m having exactly this issue. Got off the first island, teleported to Foundation, and after grappling down from the revive point, I clipped through the map. Forced a respawn, and tried again. Fell through the map once more.