gsartori opened a new issue, #15306:
URL: https://github.com/apache/grails-core/issues/15306

   ### Expected Behavior
   
   This json-view:
   
   ```
   model {
       TProduction obj
   }
   
   json g.render(obj, [
       expand: ['artwork', 'artwork.colors', 'plates'],
       excludes: [],
   ])
   ```
   
   Produced something like this with Grails 6:
   ```
   {
       "id": 2,
       "dateCreated": "2025-12-22T21:56:47.196116",
       "plates": [
           {
               "id": 4,
               "width": 2000,
               "markplateKey": "XXX",
               "dateCreated": "2025-12-22T21:56:47.287394",
               "printerRef": "XXX",
               "lastUpdated": "2025-12-22T23:34:39.773883",
               "test": false,
               "production": {
                   "id": 2
               }
           },
           {
               "id": 5,
               "width": 2000,
               "markplateKey": "XXX",
               "dateCreated": "2025-12-22T21:56:47.327023",
               "printerRef": "XXX",
               "lastUpdated": "2025-12-22T21:56:47.335597",
               "test": false,
               "production": {
                   "id": 2
               }
           },
           {
               "id": 2,
               "width": 2000,
               "markplateKey": "XXX",
               "dateCreated": "2025-12-22T21:56:47.203744",
               "printerRef": "XXX",
               "lastUpdated": "2025-12-22T21:56:47.211625",
               "test": false,
               "production": {
                   "id": 2
               }
           },
           {
               "id": 3,
               "width": 2000,
               "markplateKey": "XXX",
               "dateCreated": "2025-12-22T21:56:47.246586",
               "printerRef": "XXX",
               "lastUpdated": "2025-12-22T21:56:47.254463",
               "test": false,
               "production": {
                   "id": 2
               }
           }
       ],
       "productionKey": "XXX",
       "agentCreated": "ONLINE",
       "usernameCreated": "user",
       "artwork": {
           "id": 2,
           "width": 800,
           "printerRef": "XXX",
           "dateCreated": "2025-12-22T21:56:47.165453",
           "widthRepetitions": 1,
           "lastUpdated": "2025-12-22T21:56:47.174548",
           "manufacturerCompany": {
               "id": 3
           },
           "colors": [
               {
                   "id": 7,
                   "width": 800,
                   "dateCreated": "2025-12-22T21:56:47.186169",
                   "rgb": "FFFF00",
                   "technology": "-",
                   "coverage": 200.0,
                   "printSide": "FRONT",
                   "material": {
                       "id": 1
                   }
               },
               {
                   "id": 5,
                   "width": 800,
                   "dateCreated": "2025-12-22T21:56:47.177355",
                   "rgb": "00FFFF",
                   "technology": "-",
                   "coverage": 200.0,
                   "printSide": "FRONT",
                   "material": {
                       "id": 1
                   }
               },
               {
                   "id": 8,
                   "width": 800,
                   "dateCreated": "2025-12-22T21:56:47.19077",
                   "rgb": "000000",
                   "technology": "-",
                   "coverage": 200.0,
                   "printSide": "FRONT",
                   "material": {
                       "id": 1
                   }
               },
               {
                   "id": 6,
                   "width": 800,
                   "dateCreated": "2025-12-22T21:56:47.181853",
                   "rgb": "FF00FF",
                   "technology": "-",
                   "coverage": 200.0,
                   "printSide": "FRONT",
                   "material": {
                       "id": 1
                   }
               }
           ]
       }
   }
   ```
   
   ### Actual Behaviour
   
   Now with Grails 7 the JSON gets produced like this:
   ```
   {
       "obj": {
           "id": 2,
           "dateCreated": "2025-12-22T21:56:47.196116",
           "usernameCreated": "user",
           "agentCreated": "ONLINE",
           "dateReceived": null,
           "usernameReceived": null,
           "companyReceived": null,
           "agentReceived": null,
           "dateDeleted": null,
           "usernameDeleted": null,
           "agentDeleted": null,
           "productionKey": "XXX",
           "artwork": {
               "id": 2
           },
           "plates": [
               {
                   "id": 5
               },
               {
                   "id": 2
               },
               {
                   "id": 4
               },
               {
                   "id": 3
               }
           ]
       }
   }
   ```
   
   ### Steps To Reproduce
   
   _No response_
   
   ### Environment Information
   
   _No response_
   
   ### Example Application
   
   _No response_
   
   ### Version
   
   7.0.4


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