[Data Mapper] Diagnostics are not visible when mapping constructors contain invalid values

[madushajg]

Description:
$Subject

Steps to reproduce:
Sample source:

type Car record {
    SUV vehicle;
};

type SUV record {
    string model;
    int year;
};

type HighEndCar record {|
    Model model;
    int year;
|};

type Model record {
    string transmission;
    string engine;
};

function tnf(Car car) returns HighEndCar => {
    year: 0,
    model: "invalid-value"
};