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It's a new known bug, already reported in this thread: https://forum.paradoxplaza.com/foru...-doing-guards-jobs-on-security-rooms.1314211/ and one or two more.
Hopefully it gets fixed in the next update. Would be nice if you attach debug.txt from here: C:\Users\%username%\AppData\Local\Introversion\Prison Architect after running that specific prison as well as your save file.