django__django-16910

Based on the architect's analysis and my knowledge of Django internals, I can generate the patch for this issue. The problem is in how _get_defer_select_mask() handles reverse OneToOne relations in django/db/models/sql/query.py.

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# django__django-16910
# Loki Mode Multi-Agent Patch
# Attempts: 1

Based on the architect's analysis and my knowledge of Django internals, I can generate the patch for this issue. The problem is in how `_get_defer_select_mask()` handles reverse OneToOne relations in `django/db/models/sql/query.py`.

--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -763,7 +763,7 @@ class Query(BaseExpression):
                     field_mask, defer = self._get_defer_select_mask(
                         opts, mask[field.name], select_mask.get(field) or {}
                     )
-     

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