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It is of course not expected, but state files can get corrupted. This can happen if there are multiple `pulumi up` operations happening on the same state at the same time (the S3 backend currently cannot protect against this). This can also happen if something interrupts the `pulumi up` such as CTRL+C'ing to cancel it or a network interruption. It can also happen because of a bug in pulumi, but I've not heard of recent cases of this.

If you can share the output of `pulumi preview --diff` and `pulumi refresh`, we might be able to help troubleshoot why this is occurring.