Return argument not colored properly if multiline

[alexr00]

Type: Bug

When putting this into a TypeScript file:

type MyType<T> = { func: T };

function AFunction<T>(arg: T): MyType<T> {
    return { func: arg };
}

const x = AFunction<(arg: string) => unknown>(() => {});
const y = AFunction<
    (arg: string) => unknown
>(() => {});

The first unknown is colored but the second unknown is not for some reason.

Originally posted by @PythonCoderAS in https://github.com/microsoft/vscode/issues/199861