diff --git a/packages/datasource-mongoose/src/collection.ts b/packages/datasource-mongoose/src/collection.ts
index b7d03f371..929bc53c3 100644
--- a/packages/datasource-mongoose/src/collection.ts
+++ b/packages/datasource-mongoose/src/collection.ts
@@ -104,9 +104,9 @@ export default class MongooseCollection extends BaseCollection {
     if (this.stack.length < 2) {
       const { insertedIds } = await this.model.insertMany(data, { rawResult: true });
 
-      return flatData.map((record, index) => ({
+      return flatData.map((flatRecord, index) => ({
         _id: replaceMongoTypes(insertedIds[index]),
-        ...record,
+        ...flatRecord,
       }));
     }
 
@@ -125,7 +125,8 @@ export default class MongooseCollection extends BaseCollection {
     const updates: Record<string, { rootId: unknown; path: string; records: unknown[] }> = {};
     const results = [];
 
-    for (const record of data) {
+    for (const [index, record] of data.entries()) {
+      const flatRecord = flatData[index];
       const { parentId, ...rest } = record;
       if (!parentId) throw new ValidationError('Trying to create a subrecord with no parent');
 
@@ -138,7 +139,7 @@ export default class MongooseCollection extends BaseCollection {
 
       results.push({
         _id: `${rootId}.${path}.${updates[rootIdString].records.length - 1}`,
-        ...record,
+        ...flatRecord,
       });
     }
 
diff --git a/packages/datasource-mongoose/test/integration/flattener/_build-models.ts b/packages/datasource-mongoose/test/integration/flattener/_build-models.ts
index 3563747f1..79496de7d 100644
--- a/packages/datasource-mongoose/test/integration/flattener/_build-models.ts
+++ b/packages/datasource-mongoose/test/integration/flattener/_build-models.ts
@@ -21,7 +21,9 @@ export default async function setupFlattener(dbName = 'test') {
         }),
         horsePower: String,
         owner: { type: Schema.Types.ObjectId, ref: 'companies' },
-        comments: [{ date: Date, comment: String }],
+        comments: [
+          { date: Date, comment: String, nested: { subNested: String, subNested2: String } },
+        ],
         companies: [{ type: Schema.Types.ObjectId, ref: 'companies' }],
       },
       company: { type: Schema.Types.ObjectId, ref: 'companies' },
diff --git a/packages/datasource-mongoose/test/integration/flattener/collection_create.test.ts b/packages/datasource-mongoose/test/integration/flattener/collection_create.test.ts
index 8adf9c94c..74c2f013f 100644
--- a/packages/datasource-mongoose/test/integration/flattener/collection_create.test.ts
+++ b/packages/datasource-mongoose/test/integration/flattener/collection_create.test.ts
@@ -131,6 +131,44 @@ describe('Complex flattening', () => {
     );
   });
 
+  /** @see https://community.forestadmin.com/t/bug-report-with-smart-models-on-node-js-agent/6480/6 */
+  it('should work when creating a submodel with nested fields', async () => {
+    const flatRecord = {
+      date: '2010-01-01T00:00:00.000Z',
+      comment: 'hi!',
+      'nested@@@subNested': 'hi!',
+      'nested@@@subNested2': 'hi!',
+    };
+
+    connection = await setupFlattener('collection_flattener_create');
+
+    const dataSource = new MongooseDatasource(connection, {
+      flattenMode: 'manual',
+      flattenOptions: {
+        cars: {
+          asFields: ['engine.comments.nested'],
+          asModels: ['engine.comments'],
+        },
+      },
+    });
+
+    const [car] = await dataSource.getCollection('cars').create(caller, [{ name: 'my fiesta' }]);
+    const [carCommentFromApp] = await dataSource
+      .getCollection('cars_engine_comments')
+      .create(caller, [{ parentId: car._id, ...flatRecord }]);
+
+    const carSeenFromDb = await connection.model('cars').findOne({ _id: car._id });
+
+    expect(carCommentFromApp).toMatchObject(flatRecord);
+    expect(carSeenFromDb.engine.comments[0]).toEqual(
+      expect.objectContaining({
+        date: expect.any(Date),
+        comment: 'hi!',
+        nested: { subNested: 'hi!', subNested2: 'hi!' },
+      }),
+    );
+  });
+
   it('creating a subModel should fail', async () => {
     connection = await setupFlattener('collection_flattener_create');