UPDATE: JAmpersand found the easiest work-around. Delete a few squares of the garbage area, then add them back OR increase your garbage area in general. This will force staff to go around and collect all garbage bags that were forgotten about. You may have to do this periodically to get ones that accumulate since the last time you did.
Garbage is just sitting around the prison, not being collected and taken to the garbage "room" area.
Garbage is just sitting around the prison, not being collected and taken to the garbage "room" area.
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