Whatever the ticket says. I have done plenty of work that I couldn't tell you where it fit into the product or what button one would click to make it run as we otherwise had unit tests to verify it.
In my personal experience, it is much easier to clear this up going to the requestor itself, rather than asking a PM to clear it up. I ask them high-level questions like, "so, what is it that you really want here?" to try and suss out what the actual deliverable is.
But I agree that if you have too many projects on your plate this is untenable. But then devs having too many projects on their plate is a pretty poor situation and is indicative of bad management.
Many of us, including me, come from freelancing, and perhaps that trained many to answer most customer requests with "ok but what you really want is...", but in a company where there are people doing that as their job... Why bother?
Actually I would even go further and argue that too many passionate developers talking product management in every refinement meeting is a big inefficiency, and depending on the company size, sometimes even one is one too many.
Delegating is okay, or you burn yourself out.
A lot of it is also personality. I am odd. Very odd. At times Sheldon Cooper odd. Know the exact seat I want on a 787 vs an A220 odd. That makes my empathy for users awful. I will spend tons of money on pain points in my life that make everyone else think I am nuts. I will completely ignore areas of life that are top priorities for most people. I obsess when making decisions and willingly read reems of documents to figure out all the rules.
There are so many things that I do that normal people do not do. Because of that, I cannot create mass market products.I do not think anything like a typical user. I know my limits there.
If you can't trust your coworkers, every workplace is demotivating.