second floor visible while near a wall inside player constructed buildings

[rpi]

reproduction:

construct a standard building with a roof like this:

 

enter the building and go near a wall in the bottom right corner.

 

current behavior:

you can see the second floor, blocking the view.

 

expected behavior:

the second floor should be hidden, like it does while inside normal building not constructed by players.

 

[rpi]

also tested it without any mods here