DescriptorKey is not ignored as specified when used within a Dynamic MBean

As of Mustang b57, the javax.management.DescriptorKey says:
[...]
An annotation such as @Units can be applied to:

    * a Standard MBean or MXBean interface;
    * a method in such an interface;
    * a parameter of a method in a Standard MBean or MXBean interface when that method is an operation (not a getter or setter for an attribute);
    * a public constructor in the class that implements a Standard MBean or MXBean;
    * a parameter in such a constructor.

Other uses of the annotation are ignored.
[...]

The implementation does not behave as specified : if you use such annotation on the constructor of a Dynamic MBean, it is NOT ignored; the Descriptor for MBeanConstructorInfo will contain what comes from the annotation, it is not ignored.