In OP Prison when you're at one of the mines and your inventory is full a message (Title) comes up saying "FULL INVENTORY" However it just shows one speech mark or EXAMPLE ----> " I've attached a screenshot of the bug.
'' means what was said above, so the first time it says full inventory then it does " to show what it said previously. e.g(this is totally not related) Summer Solstice... Winter " This is what it means ^