Type Safe Proxy Creation

Imagine I have two methods:

private <T> T testGenericsT(Class<T> clazz) {
    Class[] classArray = {clazz};
    return (T) newProxyInstance(
        clazz.getClassLoader(),
        classArray,
        (proxy, method, args) -> null
    );
  }

  private AccessibleStreamable testGenerics(Class<AccessibleStreamable> clazz) {
    Class[] classArray = { clazz };
    return (AccessibleStreamable) newProxyInstance(
        clazz.getClassLoader(),
        classArray,
        (proxy, method, args) -> null
    );
  }

The upper one is not type safe, I get the warning unchecked cast java.lang.Object to T But the lower one is accepted, from my point of view I'm not sure where these differs.

Is there a way I can make the upper one typesafe?

What am I missing here, why is it perfectly fine to cast it to a AccessibleStreamable but not T?

I can even change my code like this

  private AccessibleStreamable testGenerics(Class<AccessibleStreamable> clazz) {
    Class[] classArray = { List.class };
    return (AccessibleStreamable) newProxyInstance(
        Map.class.getClassLoader(),
        classArray,
        (proxy, method, args) -> null
    );
  }

And it will still not say any warning. Of course I wouldn't expect it to give me a warning saying that I'm doing an unchecked cast to T. But I guess my main question is, is there a way I can make the upper one safe? And I don't mean by suppressing the warning.