Additionally, some walls either have been miss placed or they are made incorrectly.
08:01 You see grass. Position: {x = 3728, y = 3217, z = 6}.
08:01 You see a ???. Position: {x = 3729, y = 3228, z = 6}.
It's an inside thing, only so called 'PA legends' know about it.
Unfortunately 99.9% of them are retired because of all the great updates that followed up.