[1.11.x] Fixed #28166 -- Fixed Model._state.db on MTI parent model after saving child model.

Regression in 38575b007a722d6af510ea46d46393a4cda9ca29.

Backport of 584e10c76edcd3a33765a52c5cde0096a3ce7dbc from master

1 files changed, 3 insertions, 1 deletions

diff --git a/django/db/models/fields/related_descriptors.py b/django/db/models/fields/related_descriptors.py
index af6fdc3e25..7cb6448bd7 100644
--- a/django/db/models/fields/related_descriptors.py
+++ b/django/db/models/fields/related_descriptors.py
@@ -288,7 +288,9 @@ class ForwardOneToOneDescriptor(ForwardManyToOneDescriptor):
             # on the related model for every deferred field.
             if not any(field in fields for field in deferred):
                 kwargs = {field: getattr(instance, field) for field in fields}
-                return rel_model(**kwargs)
+                obj = rel_model(**kwargs)
+                obj._state.db = instance._state.db
+                return obj
         return super(ForwardOneToOneDescriptor, self).get_object(instance)