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The previous logic was systematically attempting to retrieve last_insert_id even for models without an AutoField primary key when they had a GeneratedField on backends that can't return columns from INSERT. The issue affected MySQL, SQLite < 3.35, and Oracle when the use_returning_into option was disabled and could result in either crashes when the non-auto primary key wasn't an IntegerField subclass or silent misassignment of bogus insert ids (0 or the previous auto primary key insert value) to the first defined generated field value.
