But we cannot change this logic, can we make it work by adding any pactflow setting?

This isn't a Pactflow problem, so this belongs in #C9UTHV2AD I guess. You'll probably have better luck getting an answer there..

In fact, it’s not a Pact problem as far as I can tell. If your JSON is one shape and your model expects another, that is a serialisation/deserialisation problem.