Upper level where it should not exist?

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

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.