In my experience, whatever boundaries are set within an agile engineering group can be overridden by the priorities, roadmaps, etc. that are imposed from above by the corporate executives. Responsibilities can change overnight as staff are reorganized or laid off by powers beyond their control.
Every scrum team I've ever been on fell into that pattern eventually. Companies adopted Scrum because it became the trendy way to signal that you're a modern company. Not because of any actual commitment to its framework.
In reality, Scrum went from "empower engineers" to "allow managers to micromanage their employees even more, but we call it Agile so you can't push back against it because then you're challenging the orthodoxy."
well, my answer is theoretical. My own experience is similar to yours: "your team is no longer following scrum in a mad-rush attempt to deliver the deadline." and then everything gets even worse
