Grails 4 Mapping exception - org.grails.datastore.mapping.model.IllegalMappingException: Non-existent mapping property

Question

I am upgrading from grails 2.5.4 to 4 and getting the following error in grails 4 : Failed to instantiate [org.grails.orm.hibernate.HibernateDatastore]: Constructor threw exception; nested exception is org.grails.datastore.mapping.model.IllegalMappingException: Non-existent mapping property [parent] specified for property [children] in class [Domain]

The class and interface are :

class Domain implements Domainable, Serializable {
  String name
  Domain parent
  static hasMany = [
      children       : Domain
  ]
  static mappedBy = [
    children: 'parent'
  ]
 }

interface Domainable {
  public Domainable getParent()
}

when getter method in interface is removed, it works fine, but with the getter method in interface, it gives the above error. It was working fine in grails 2.5.4