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That error message should be improved.

The code inside your custom CRUD operations is run in a seperate Node process, potentially after your main application completes (or even in cases where you main program doesn't run).  As a result, you cannot create new resources or call `.getFoo`-style methods inside these.

Some of this is discussed in the *Note* at <https://www.pulumi.com/docs/reference/programming-model/#dynamicproviders>.

<@UB3BGTV63> For some reason some outputs in the dynamic resource are undefined, instead of being pulumi.Output&lt;&gt;.
Any idea why that can be?

You might be seeing the same thing called out in <https://github.com/pulumi/docs/issues/1375> which I will be adding to docs imminently.

<@UB3BGTV63> I upgraded to the latest pulumi version, but there are still those permanent diffs

Which permanent diffs?  Do you have an issue link?