MalformedParameterizedTypeException when bounded generic attribute without visibility modifier

This code fails in runtime with MalformedParameterizedTypeException - run main to try it out:

class Dependency<T> {
}

class Something<T extends Number> {
    Dependency<? super T> dependency

    static main(String[] args) {
        new Something<Integer>()
    }
}

However, it does not fail if a visibility modifier is added before dependency attribute - private, protected, public or @PackageScope transformation.

This also fails with MalformedParameterizedTypeException and I don't know how to make it work:

class Something<T extends Number> {
    void someMethod(Dependency<? super T> dependency) {
    }

    static main(String[] args) {
        new Something<Integer>()
    }
}

Do you know what may be the cause? Do you know of any workaround for the second case?