Fixed #25255 -- Recorded unapplied squashed migrations.

django/db/migrations/executor.py

@@ -250,12 +250,11 @@ class MigrationExecutor:
         if not fake:
             with self.connection.schema_editor(atomic=migration.atomic) as schema_editor:
                 state = migration.unapply(state, schema_editor)
-        # For replacement migrations, record individual statuses
+        # For replacement migrations, also record individual statuses.
         if migration.replaces:
             for app_label, name in migration.replaces:
                 self.recorder.record_unapplied(app_label, name)
-        else:
-            self.recorder.record_unapplied(migration.app_label, migration.name)
+        self.recorder.record_unapplied(migration.app_label, migration.name)
         # Report progress
         if self.progress_callback:
             self.progress_callback("unapply_success", migration, fake)

tests/migrations/test_executor.py

@@ -653,6 +653,23 @@ class ExecutorTests(MigrationTestBase):
             recorder.applied_migrations(),
         )
 
+    @override_settings(MIGRATION_MODULES={'migrations': 'migrations.test_migrations_squashed'})
+    def test_migrate_marks_replacement_unapplied(self):
+        executor = MigrationExecutor(connection)
+        executor.migrate([('migrations', '0001_squashed_0002')])
+        try:
+            self.assertIn(
+                ('migrations', '0001_squashed_0002'),
+                executor.recorder.applied_migrations(),
+            )
+        finally:
+            executor.loader.build_graph()
+            executor.migrate([('migrations', None)])
+            self.assertNotIn(
+                ('migrations', '0001_squashed_0002'),
+                executor.recorder.applied_migrations(),
+            )
+
     # When the feature is False, the operation and the record won't be
     # performed in a transaction and the test will systematically pass.
     @skipUnlessDBFeature('can_rollback_ddl')