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By using `select_related(None)` instead of `select_related()`, the unnecessary joins are completely avoided. Note that the current tests already covers the change, when the field is not `null=True`. Regression in f9936deed1ff13b20e18bd9ca2b0750b52706b6c. Backport of 517d3bb4dd17e9c51690c98d747b86a0ed8b2fbf from main
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