[_y5hn]

If you were your manager, making your case. What would you say: Would you, in writing, enquire to know at what date you might expect to be relieved of your former duties? Who is provided for knowledge transfer?

Point is, having another role and being in the same company, you may reasonably expect some "support" for your old role. If you take this as failure of management, you can make demands from strength (of course in a diplomatic and understanding way).

At any time, dev work may make you miss deadlines, and where's that replacement?