Setting embedded Shape object to null doesn't work in 7.0.7

[injecteer]

My domain classes are like:

@Entity
class Arbitrary {
  
  String id

  Map<String,Object> data
  
  Geometry geometry
    
  static embedded = [ 'data', 'geometry' ]
}

and

import grails.mongodb.geo.MultiPoint
@Entity
class Geometry {
  MultiPoint points
}

Setting the arbitrary.data = null in controller works just fine, but arbitrary.geometry = null is ignored.

In order to dance the problem around, I defined a fake constant and the checker method in Geometry class, like so:

class Geometry {
  ...
  static final KINDA_NULL = new Geometry( points:MultiPoint.valueOf( [ [ 0, 0 ] ] ) )
  
  boolean kindaNull() {
    points == KINDA_NULL.points
  }
}

and added the interceptor into Arbitrary class like so:

class Arbitrary {
  ...
  def afterUpdate() {
    if( geometry.kindaNull() )
      Arbitrary.collection.update( [ _id:getId() ], [ $unset:[ geometry:1 ] ] )
  }
}

Then it works kinda as expected.