Yeah, I quickly ran through until I got the floor again. It’s this one.
The dark grey bits on the sides have living mobs around for (what I assume is) ambience to make the place look larger, but I’ve combed up and down the floor and I can’t find any grappling hook or path to reach them. When I gave up and left, the game said I managed to miss 26% of the completion rate despite combing up and down the entire walkable area while spamming tab-target to ensure I didn’t miss any vases.