We have a sprint that lasts 15 days. Due to the complexity of the project and a large accumulation of technical debts, there is a convention that after generating the increment there is a battery of regressive tests that last an average of 2 or 3 days.
The product is not released until the tests are completed. However, how to deal with the situation that during regressive tests new problems can be detected and the team is already working on another sprint?