Not sure exactly what's going on, but "GraphHoper (Bicycle)" happily suggested that I climb up these stairs with a bike (it still does, but I'm not sure whether it's a cache issue or still a route computation one).

I thought maybe being explicit would prevent it from doing so.

Thanks for the clarification. I think I fixed my mistake, don't hesitate if you need to modify it more or just revert my changes.

The previous version was of type "line". I changed it to type "area" (I did not find a way to change it without deleting and redrawing it). If I broke something doing it, sorry and feel free to repair.

The actual problem I'm trying to solve is that the room doesn't show up on maps, but It doesn't seem that my solution solved it.