diff --git a/packages/runtime/src/enhancements/delegate.ts b/packages/runtime/src/enhancements/delegate.ts
index ea31fe02d..579dc31c6 100644
--- a/packages/runtime/src/enhancements/delegate.ts
+++ b/packages/runtime/src/enhancements/delegate.ts
@@ -194,15 +194,13 @@ export class DelegateProxyHandler extends DefaultPrismaProxyHandler {
 
                         if (this.injectBaseFieldSelect(model, field, value, args, kind)) {
                             delete args[kind][field];
-                        } else {
-                            if (fieldInfo && this.isDelegateOrDescendantOfDelegate(fieldInfo.type)) {
-                                let nextValue = value;
-                                if (nextValue === true) {
-                                    // make sure the payload is an object
-                                    args[kind][field] = nextValue = {};
-                                }
-                                this.injectSelectIncludeHierarchy(fieldInfo.type, nextValue);
+                        } else if (fieldInfo.isDataModel) {
+                            let nextValue = value;
+                            if (nextValue === true) {
+                                // make sure the payload is an object
+                                args[kind][field] = nextValue = {};
                             }
+                            this.injectSelectIncludeHierarchy(fieldInfo.type, nextValue);
                         }
                     }
                 }
diff --git a/tests/regression/tests/issue-1522.test.ts b/tests/regression/tests/issue-1522.test.ts
new file mode 100644
index 000000000..bc6a9fb34
--- /dev/null
+++ b/tests/regression/tests/issue-1522.test.ts
@@ -0,0 +1,92 @@
+import { loadSchema } from '@zenstackhq/testtools';
+describe('issue 1522', () => {
+    it('regression', async () => {
+        const { enhance } = await loadSchema(
+            `
+            model Course {
+                id          String       @id @default(uuid())
+                title       String
+                description String
+                sections    Section[]
+                activities  Activity[]
+                @@allow('all', true)
+            }
+
+            model Section {
+                id         String     @id @default(uuid())
+                title      String
+                courseId   String     
+                idx        Int        @default(0)
+                course     Course     @relation(fields: [courseId], references: [id])
+                activities Activity[]
+            }
+
+            model Activity {
+                id        String       @id @default(uuid())
+                title     String
+                courseId  String       
+                sectionId String       
+                idx       Int          @default(0)
+                type      String
+                course    Course       @relation(fields: [courseId], references: [id])
+                section   Section      @relation(fields: [sectionId], references: [id])
+                @@delegate(type)
+            }
+
+            model UrlActivity extends Activity {
+                url     String
+            }
+
+            model TaskActivity extends Activity {
+                description String
+            }
+            `,
+            { enhancements: ['delegate'] }
+        );
+
+        const db = enhance();
+        const course = await db.course.create({
+            data: {
+                title: 'Test Course',
+                description: 'Description of course',
+                sections: {
+                    create: {
+                        id: '00000000-0000-0000-0000-000000000002',
+                        title: 'Test Section',
+                        idx: 0,
+                    },
+                },
+            },
+            include: {
+                sections: true,
+            },
+        });
+
+        const section = course.sections[0];
+        await db.taskActivity.create({
+            data: {
+                title: 'Test Activity',
+                description: 'Description of task',
+                idx: 0,
+                courseId: course.id,
+                sectionId: section.id,
+            },
+        });
+
+        const found = await db.course.findFirst({
+            where: { id: course.id },
+            include: {
+                sections: {
+                    orderBy: { idx: 'asc' },
+                    include: {
+                        activities: { orderBy: { idx: 'asc' } },
+                    },
+                },
+            },
+        });
+
+        expect(found.sections[0].activities[0]).toMatchObject({
+            description: 'Description of task',
+        });
+    });
+});