associated property filtering not working with multiple associations to same domain class property

given two domain classes

class MyDomain {
    User createdBy
    User lastUpdatedBy
}
class User {
}

you cannot filter with associatedProperties="$

" because the referenced class property is used as map key which is in this scenario 2x the same User.id GrailsDomainClassProperty. And here i am not speaking of values (they make no difference) but of equality of the GrailsDomainClassProperty instance.

FilterPaneTagLib.groovy: refProperty = refDomain.identifier ... finalProps[refProperty] = dottedName

this means only the last association based on the same property is used, former ones are overridden.