just to add something. I'm aware of the placement of the clock being a problem. It was the first item I removed when I tried to locate what blocked the usage of the stairs. The problem is that removing them doesn't solve the bug. And it was repeatable. After I painstakingly duplicated the whole layout in a second building everything worked just fine, until I placed the clock and from then on the second building stopped working as well..
I think I found the culprit. It was a bit difficult to find because it was not only the clock but also the items on the corner counter beneath the stairs. The problem with these was, that sometimes they worked and sometimes not. Seems to be a somewhat wonky check that just ends up being positive or negative at random. So she'd walk up and down a couple of times no problem and without any changes to the layout all of a sudden decided she couldn't walk the stairs anymore. I'd say it's solved but if you'd like to play around with it out of interest I can ofc upload it.
