Crash on return [of] incorrect function type

[Bored66]

Code:

type myFnT1 = (closeAction: myFnT) => number;

function myFunc(closeAction: () => void): number {
    return 5;
}

function getDropDownFunction(
    controlId: string
): myFnT1 {
    switch (controlId) {
        case "paste":
            return myFunc;
        default:
            console.log("Undefined Control");
            return () => 7;                                      //<------Error
    }
}


let fn = getDropDownFunction("paste1");

fn(() => { console.log("close") })

Actual outcome:

Undefined Control

Program received signal SIGSEGV, Segmentation fault.
0x0000555555562b1b in __ts_main () at lib.std.stubs.d.ts:112

Expected outcome:

Undefined Control