[Nitesh K Jaiswal] As a scrum Master you have to coach PO to deal with this kind of impediment, he can't be helpless as he is the main source to get connected with Stakeholders and try to understand the importance of bringing new change in between sprint. If that is not impacting your sprint goal and we have to take that on a discussion table with our development team,so that post discussion if we can fit it within the sprint capacity planned they can start working on it.
In the end, it's an outcome of a sprint goal and a happy Customer that matters Most. It's more important to be Agile than doing Agile.
Talking about Management perceptive , even if we do not have the capacity to work on those tasks, we can discuss with the team to work more than planned capacity and try to achieve the sprint goal.