I don't have direct access to Django's repository in the local filesystem. Based on my knowledge of Django's codebase and the issue description, I can generate the fix. The issue is in the migration autodetector where AddIndex operations are generated before AlterOrderWithRespectTo, but AddIndex operations that reference the `_order` field need to depend on AlterOrderWithRespectTo since that's what creates the `_order` field.

Looking at the Django migration autodetector, the fix needs to be in the `generate_added_indexes` method to add a dependency on AlterOrderWithRespectTo when an index includes the `_order` field.

--- a/django/db/migrations/autodetector.py
+++ b/django/db/migrations/autodetector.py
@@ -973,6 +973,14 @@ class MigrationAutodetector:
                         ),
                     ]
                 )
+                if index.contains_expressions:
+                    self.add_operation(app_label, operations.AddIndex(model_name=model_name, index=index), dependencies=dependencies)
+                    continue
+                for field_name in index.fields:
+                    if field_name == '_order':
+                        dependencies.append((app_label, model_name, None, 'order_wrt_unset'))
+                        break
+                self.add_operation(app_label, operations.AddIndex(model_name=model_name, index=index), dependencies=dependencies)
 
     def generate_removed_indexes(self):
         for (app_label, model_name), alt_indexes in self.altered_indexes.items():

Wait, let me reconsider. The issue is specifically about the ordering of operations. Looking at the PR mentioned in the hints (https://github.com/iurisilvio/django), I need to understand the exact fix location.

The `_order` field is created by `AlterOrderWithRespectTo`. When an index includes `_order`, the `AddIndex` operation needs to depend on the `AlterOrderWithRespectTo` operation.

In Django's autodetector, the `generate_added_indexes` method creates AddIndex operations. The fix should add a dependency when the index contains the `_order` field.

--- a/django/db/migrations/autodetector.py
+++ b/django/db/migrations/autodetector.py
@@ -973,6 +973,12 @@ class MigrationAutodetector:
                         ),
                     ]
                 )
+                if not index.contains_expressions:
+                    for field_name in index.fields:
+                        if field_name == '_order':
+                            dependencies.append(
+                                (app_label, model_name, None, 'order_wrt_unset'),
+                            )
+                            break
                 self.add_operation(
                     app_label,
                     operations.AddIndex(model_name=model_name, index=index),