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If you look at the migration doc there are some changes to the mocks: <https://www.pulumi.com/docs/get-started/install/migrating-3.0/#changes-to-pulumiruntimemocks> (make sure you select python as a language). Have you made those changes?

yeah, I applied those changes, but when you call pulumi.StackReference, it seems they are picking up the fact and a mock is not created