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Changes between Initial Version and Version 1 of Ticket #22594, comment 1

-              initial
+              v1
+Curiously, both pre_delete and post_delete signals are fired in the failing case... What happens in the middle?
+Wait... If I define an empty signal receiver, it works! (????) I've just added:
+{{{
+from django.db.models.signals import pre_delete, post_delete
+from django.dispatch import receiver
+@receiver(pre_delete)
+def pre_delete_receiver(**kwargs):
+    pass
+}}}
+And now the deletion is performed...