Generic type with the ability to compile wildcards in java

Question

I ran into a general problem against a template in java.

class A<T> {
    T value;
}

class B<T> {
    T value;
}

public <T> A<? extends B<T>> methodA() {

    A<B<Object>> gg = fetchFromSomeLocation();
    return (A<? extends B<T>>) gg;
}

public <T, E extends B<T>> A<E> methodB() {

    A<B<Object>> gg = fetchFromSomeLocation();
    return (A<E>) gg;
}

So method B () compiles fine, no problem. But method A causes compilation to fail with:

incompatible types: A<B<java.lang.Object>> cannot be converted to A<? extends B<T>>

I can’t understand why this is so.

PS on Intellij shows how correct the correct code.

EDIT

so apparently this compiles just fine

public static <T> A<? extends B<T>> methodC() {

    A<B<Object>> gg = new A<>();
    return (A<? extends B<T>>)(A<?>) gg;
}