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Changes between Version 4 and Version 5 of Ticket #33050

-              v4
+              v5
 }}}
+reproduced on on 3.2.5/3.2.6
 suggested fix:
 on django.db.models.sql.query.py -> Query.get_aggregation, from
 …
                 combined_query.select_related = False
             inner_query.set_annotation_mask(self.annotation_select)
 }}}
 can solve the problem I think.
 …
 def get_aggregation(self, using, added_aggregate_names):
+    original_select_related_values = {}
+    for combined_query in self.combined_queries:
+        original_select_related_values[combined_query] = combined_query.select_related
+    cloned_self = self.clone()
+    for combined_query in cloned_self.combined_queries:
         combined_query.select_related = False
+    result = old_get_aggregation(self, using, added_aggregate_names)
+    for combined_query in self.combined_queries:
+        combined_query.select_related = original_select_related_values[combined_query]
+    return result
+    return old_get_aggregation(cloned_self, using, added_aggregate_names)
 Query.get_aggregation = get_aggregation
 }}}
-reproduced on on 3.2.5/3.2.6