Time that won’t be spent on implementing those shiny new features.
The tax you are paying for using Scrum

Sure it it hard to say the reason you can’t cook new meals because you have to re-cook meals that have been returned to a kitchen. It hurts, but get it right. Start improving your quality standards, introduce more stringent Definitions of Done and boost your inspections prior to anything going out to the customer. This is embedded in Scrum.