It's the PM's responsibility to ensure the request is captured. It's the engineers job to deliver on the captured request.

It's both people's job to talk to one another to ensure the captured request is correct.

Sorry, you're right, that wasn't clear. It isn't my job to remember the history of every request your team has ever submitted to my team.

If you have a custom process that we don't know about or that your predecessor requested of my predecessor, I don't expect to be aware of that. And when it causes issues, I don't see why that's my fault