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I expect this is only an issue during the initial preview?

I believe it is likely ultimately due to the same issue as <https://github.com/pulumi/pulumi-azure/issues/192>, and see also <https://github.com/pulumi/pulumi/issues/4040>.

I believe you can workaround that with:

```rrdatas = [ instance.network_interfaces[0].apply(lambda nic: nic.get('networkIp', 'unknown') ],```