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Changes between Version 1 and Version 2 of Ticket #28385, comment 5

-              v1
+              v2
 >     if obj.pk is None or (hasattr(Model, 'natural_key') and hasattr(Model._default_manager, 'get_by_natural_key')):
+If  `pk` is set - it is update model via `return obj` without `updating pk` logic.
+If `pk` isn't set, but `natural key` implementation exists - `if False or True` (return `True`) - go to `updating pk` logic.
+If `pk` is set - it updates model via `return obj` without `updating pk` logic.
+If `pk` isn't set as like as `natural key` implementation - it updates model via `return obj` without `updating pk` logic.
+If `pk` isn't set, but `natural key` implementation exists - go to `updating pk` logic.
 I did test manually, it seems bug is fixed.