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It depends on how its corrupted, but you might need to manually edit the JSON.
Before jumping to that, however, give `pulumi state delete` a try first.

Do you have versioning enabled on the S3 bucket?  If so, backup the current version offline and trying to revert may be worthwhile, depending on how big/valuable the last update was

This may also be relevant - old issue but still open on GCP / Azure at least <https://github.com/pulumi/pulumi/issues/4679>