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Are you getting this different behavior across different projects or different stacks of the same project?

The AWSX output types did change a while back so I suspect you were on a previous version and updated recently.

You need to use the publicSubnetIds output like this in the latest AWSX version:

```subnetId: pulumi.output(vpc.publicSubnetIds.then(ids =&gt; ids[0])),```

Same project, that code works so thank you but now I wonder why it works elsewhere

That is strange. Is this all on the same machine too? If so, it should be using the same `package-lock.json` to keep the stacks all on the same versions.