perhaps the main issue is that if a yard is fully enclosed, whether it has a door or not, it may trigger as acceptable..
Foundations need doors, this is nothing new. A foundation will not complete until it has a door. Building four joined foundations around a central square will not complete without placing a door. This is the intended behaviour. Once a door is placed, the foundations complete and the yard is secure.
Let me try to explain.
Yes, I put a door on the outer wall of the foundation to finish it, as always. But, what I discovered was that a yard fully enclosed by the donut shaped foundation (which means the foundation has that extra inner wall with the outdoor center) did not need a door on the inner wall for the yard to become acceptable as a fully functioning yard. Yes, that is intended behavior, because the outer wall door would continue to keep it acceptable. But that is still hilarious because the prisoners can't actually get in to use it.
Now, I may be wrong about this... but what I believe Error was talking about was that he experienced the need for that second inner wall door to make the yard acceptable in the first place, which would make sense cause prisoners can then get into it, right? But then after removing the inner door, the yard continued to stay acceptable because the outer wall door (or some other perimeter door) was good enough to keep it acceptable. He considered this to be a bug (naturally) and felt the yard should have gone back to being unacceptable because you can't get inside it.
But you bring up an interesting point, pakt... it's possible that Error didn't finish the foundation with the outer wall door first, which would then make the yard need any door at all to make it function, and if he put the inner wall door on first to finalize the foundation, then it would also act as the main door to the yard! Then after that, both he and I experience the same! Prisoners can't get in!
And THAT would mean Error's... error... wasn't actually an error at all, but incredible circumstance!!
Yup, I think I figured it out. And now my head hurts, but man that was bugging my brain for two days!