Compile error if iterate ISequence<T> in mapped class on iOS

Add following codes to compile:

public __mapped class MappedClass => Object{

    public void test<T>(ISequence<T> seq) {
        foreach (var item in seq) {
        }
    }
}

And there will be an compile error:
(E0) Internal error: Object reference not set to an instance of an object.

Thanks, logged as bugs://72473

bugs://72473 got closed with status fixed.