Why doesn't reflections.getSubTypesOf(Object.class) find enums?

If I have

Reflections reflections = new Reflections("my.package", classLoader, new SubTypesScanner(false));

then this finds my enum classes

Set<Class<? extends Enum>> enums = reflections.getSubTypesOf(Enum.class);

but this doesn't

Set<Class<?>> classes = reflections.getSubTypesOf(Object.class);

Is there a reason for this?

---

Reproducible example:

package cupawntae;

import org.reflections.Reflections;
import org.reflections.scanners.SubTypesScanner;

public class Reflector {
    public static void main(String[] args) {
        Reflections reflections = new Reflections("cupawntae", Reflector.class.getClassLoader(), new SubTypesScanner(false));
        System.out.println("Objects: " + reflections.getSubTypesOf(Object.class));
        System.out.println("Enums: " + reflections.getSubTypesOf(Enum.class));
        System.out.println("Enum's superclass: " + Enum.class.getSuperclass());
    }
}

Enum class:

package cupawntae;

public enum MyEnum {
}

Output:

Objects: [class cupawntae.Reflector]
Enums: [class cupawntae.MyEnum]
Enum's superclass: class java.lang.Object