Lightless Arbor: can't get pass the 1st room (after using the key)

I got the key for the Lightless Arbor.
I ported there, opened the door with the key, got into the 1st room, read the info about the Illumination and tried to go further.
There was 2 doors open but once I get close to any of them character stumbles and falls back.
Player.log (60.6 KB)