If you get paid hourly then perhaps. If it is irrefutable that its your fault/bug then you should feel obligated to fix for no extra charge/hours to them.
Currently illegal in most if not all US states. When an hourly employee does work, they must be paid for all of their time.
I certainly wouldn't want to see this change. Way too much room for abuse on the employer side. I think the current remedy is sufficient (if any employer thinks someone is screwing up too much, they can fire them).
The end of labor is to gain leisure.