In the past, back in MA, I needed a vent for a stove hood. A roofer put in the vent on the roof but the person who installed the hood put in the duct work.
One time I had and electrician who put in a bath room vent and did all the work, vent in eave and duct, himself.
But in general my guess is that the roofer wouldn't put in the duct work. But when you talk to the roofer tell them what you have found... it's probably something they have seen before and what you will have to do to get it fixed. The vent on the roof should have something on to prevent rain from being blown in though.
But if water is collecting in the duct then just sealing it up would not fix the problem. It the duct was fully sealed it would eventually just fill up with water. If that duct was being used that could be a bigger problem than just a leak. Even if the duct wasn't being used a duct full of water would eventually cause an issue.
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