In the JDK 8 the new assertion was added to the Class.getMethod[s] spec:
"Static methods declared in superinterfaces of the class or interface represented by this Class object are not considered members of the class or interface."
See JDK-8009411 for details.

According to this assertion static methods declared in interface are not considered members of this interface. However, such methods are returned by the Class.getMethod[s] methods.

Lets consider the following minimized test (failed JCK tests are under development):
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public class MinimizedTest {

    public static void main(String[] args) throws IOException {
        Method[] methods = I.class.getMethods();
        for (Method m : methods) {
            System.out.println(m.getName());
        }
    }
}

interface I {
    static void m() {}
}
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Expected that there will be no output, however the output will be:
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m

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Probably, the problem is only in the spec, it is vague and need to be clarified.