If you place random sofas in your prison without any room assignment, your staff members will leave the staff canteen / staff room and bring their food tray to those sofas and also leave it there when done eating. Guards then have to move the dirty food tray to the staff kitchen. In other words, your staff members won't use the tables and benches of the staff canteen and use those unassigned areas instead. By default, the staff canteen should have priority -- I also have no explanation, that they are not using the staff room for example, where sofas also exist. I have reported this bug before, but I was posting it on Steam.
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