static fields on interface not getting initialized, when being initialized to an anonymous class instance

The following code shows a static field on an interface not initialized at the point when the constructor of an instance of an implementing class is being run.

package ignored.alex.failingcallsite

import java.lang.reflect.Field;

class FailingCallSiteLocalClass {
	public static void main(String[] args) {
		new B()		
	}
}

interface A {
	public static X x = new X() {
		public void foo() {}
	}
}

interface X {
	void foo()
}

class B implements A {
	public B() {
        for (Field f in getClass().getFields()) {
			println f
			println f.get(this)
		}
	}
}

Throws java.lang.IllegalAccessError when x is accessed via f.get(this).

I would expect x to have been initialized by this point. Is there something subtle in when interfaces are initialized?

There is no problem if A is a class extended by B, and more curiously, no problem if x is set equal to a named outer class (e.g. a class X2 implements X).