MethodHandles.privateLookupIn() always succeeds when target is in unnamed module

MethodHandles.privateLookupIn() is specified to throw IllegalAccessException if lookup class' module doesn't read target's module. However, IllegalAccessException is not thrown if target's module is unnamed.

Example:
=============================
Sources:

// m/module-info.java
module m {
    exports pkg;
}

// m/pkg/Named.java
package pkg;

import java.lang.invoke.MethodHandles;

public class Named {
    public static MethodHandles.Lookup lookup() {
        return MethodHandles.lookup();
    }
}

// classes/Unnamed.java
import pkg.Named;

import java.lang.invoke.MethodHandles;

public class Unnamed {
    public static void main(String[] args) throws IllegalAccessException {
        MethodHandles.Lookup startingLookup = Named.lookup();
        Class<?> targetClass = Unnamed.class;

        System.out.println("Lookup class module: " + startingLookup.lookupClass().getModule().getName());
        System.out.println("Target class module: " + targetClass.getModule().getName());
        System.out.println("Lookup class module reads target class module: " + startingLookup.lookupClass().getModule().canRead(targetClass.getModule()));

        MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(targetClass, startingLookup);

        System.out.println("Resulting lookup: " + lookup);
        System.out.println("Resulting lookup class: " + lookup.lookupClass());
        System.out.println("Resulting lookup modes: " + lookup.lookupModes());
    }
}

=============================
Output:

Lookup class module: m
Target class module: null
Lookup class module reads target class module: false
Resulting lookup: Unnamed
Resulting lookup class: class Unnamed
Resulting lookup modes: 31