Failed to calculate preview for element in hostRules: interface conversion: interface {} is []interface {}, not *schema.Set

[erlichmen]

Describe what happened

Description

I am encountering an warning (error?) when attempting to create a gcp.compute.URLMap. The error occurs during the preview stage, I don't know if and how this has effect on the resource creation flow. Also I don't know if this is a Terraform issue or Puumi's

Error Message

Failed to calculate preview for element in hostRules: interface conversion: interface {} is []interface {}, not *schema.Set

Environment

• Pulumi version: pulumi version v3.149.0
• Pulumi GCP Provider version: @8.18.0

Sample program

Code Sample

import * as gcp from "@pulumi/gcp";

const urlMap = new gcp.compute.URLMap("example-url-map", {
    hostRules: [{
            hosts: [domain],
            pathMatcher: "path-matcher",
    }],
    pathMatchers: [{
        name: "path-matcher",
        pathRules: [{
            paths: ["/test"],
            service: "projects/my-project/global/backendServices/another-backend",
        }],
    }],
});

Log output

No response

Affected Resource(s)

No response

Output of pulumi about

CLI
Version 3.149.0
Go Version go1.23.6
Go Compiler gc

Plugins
KIND NAME VERSION
language nodejs 3.149.0-dev.0

Host
OS darwin
Version 15.3
Arch arm64

This project is written in nodejs: executable='/Users/erlichmen/.nvm/versions/node/v20.14.0/bin/node' version='v20.14.0'

Backend
Name pulumi.com
URL https://app.pulumi.com/erlichmen
User erlichmen
Organizations erlichmen, doitintl
Token type personal

Additional context

No response

Contributing

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[VenelinMartinov]

Hi @erlichmen, thanks for reporting. This is an issue we are investigating, similar to #2953 and caused by pulumi/pulumi-terraform-bridge#2892

We have no workaround yet, aside from downgrading to version 8.15 of the provider. The issue has no effect on the correctness of your infrastructure - it only affects the preview experience. Pulumi fails to generate a preview for the changes made.

We are actively working on a fix and will let you know once we have something here.

[erlichmen]

Thank you for the prompt response, indeed downgrade helped

[pulumi-bot]

This issue has been addressed in PR #2977 and shipped in release v8.19.1.