I really don’t know if it is a bug matter so I decided to post it here anyway.
Maybe it’s the way criminals would use to escape the prison.
I could go on the upper level while standing on a ladder that only goes down
0.C-10220-g10fbbbb
Youre climbing onto the ‘roof’.
But since cielings dont exist the onlynthings up here are the bars.
Not a ‘bug’, more like poor/unimplemented Z-levels.