Mockito specific matchers like anyString() don't seem to work with overloaded methods?

I'm attempting to write a unit test for a class with JUnit and Mockito and in my testing, I've found that a method that I'm trying to stub is actually overloaded and has two definitions, one with 3 strings as an arg and returns an object, another with four strings and returns a list of the aforementioned object. I'm curious as to why matchers such as anyString() don't seem to successfully stub the method, while any() does.

Is there any way I can get more specific matchers to work, or am I stuck with using any() for overloaded methods?

An example of what I mean:

public String testedMethod(String s) {
    //I want to mock this
    return classObject.method(String first, String second, String third);
}

public class classObject {
    public String method(String first, String second, String third) {
        return "3 args";
    }

    public List<String> method(String first, String second, String third, String fourth) {
        ArrayList<String> returned = new ArrayList<>();
        returned.add("4 args");
        return returned;
    }
}

@Test
public void testClassMethod() {
    //this doesn't work
    //Mockito.when(classObject).method(Mockito.anyString(), Mockito.anyString(), Mockito.anyString()).thenReturn("successful stub");

    //this does work
    Mockito.when(classObject).method(Mockito.any(), Mockito.any(), Mockito.any()).thenReturn("successful stub");

    //only passes with the second mock
    Assert.assertEquals("successful stub", testedClass.testedMethod("a string"));
}