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This is a bug - if you could open an issue to track, that would be great. I believe it will only happen if you have two different versions of

@pulumi/Pulumi

in your program, and the parent resource was using the older version while the child was using the newer. If you can update your versions to be consistent, I believe that would allow you to workaround this in the meantime.

Hey @white-balloon-205, that's a great tip. I will try to see if any versions differ (though that was my first idea and I thought I did harmonize the version 😉 ). Should I still open a GitHub issue even if the cause is just version inconsistencies?

Yes - an issue would still be useful so we can prevent this from being a problem even when there are mismatched versions.

Alright, will create one then once I narrowed this down 👍

Thanks. This is fixed now with https://github.com/pulumi/pulumi/pull/2942.

Wow, that was fast 🙂