New bug for you to handle today. When placing an object out of bounds, so that the grey preview becomes red, the game should prevent you from placing it. This is true enough for the table and chair, but not the register. Since you start with $1250 and the register costs $650, you can accidentally softlock by placing the only register you can buy out of bounds. The register will not place(It presumably disappears into the black lagoon), but you will be charged by the capitalistic furniture company for the delivery and non-return of the product regardless. You cannot purchase another and the customer and worker become stuck on the top left tile even if you push "start day". The worker will now lie back and calmly part you of your remaining funding as you pass out the days.
As a new question, exactly how are the tables and chairs meant to work? A customer will go sit in a chair for a time if available, and will stand around awkwardly if not. Does the chair need to be attached to a table? Do the customers even care internally if you make them all share a single chair in the middle of the room?
Edit: That worker slouch who I refuse to pay won't take your money without a workstation, oddly enough.