Source image is getting centos/ appended to the beginning of source_image if using the source_image variable

[snahim-g]

TL;DR

If I put "windows-cloud/windows-2019" for my source image, it is changed to "centos-cloud/windows-cloud/windows-2019" in the disk configuration

Expected behavior

source_image would be the same value that I used and not modified.

Observed behavior

     + disk {
          .....
          + source_image = "centos-cloud/windows-cloud/windows-2019"
           .......
        }

centos-cloud is being appended to the front of my string.

Terraform Configuration

"instance-template" {
   source  = "terraform-google-modules/vm/google//modules/instance_template"
# version                        = "~> 7.7.0"

  project_id = module.host-project.project_id
  name_prefix  = "net-c" 

  tags = var.tags

  #labels = var.lables

  machine_type = var.machine_type
  
  region = var.primary_region
  source_image = var.source_image
  disk_size_gb = var.disk_size_gb  
  disk_type = var.disk_type  
  network = module.vpc.network_self_link
  subnetwork = var.subnet_name 
  network_ip = var.network_ip
  subnetwork_project = module.host-project.project_id
 
  service_account = {
        email = null
        scopes = []
    }
}

Terraform Version

Terraform v1.0.9
on linux_amd64
+ provider registry.terraform.io/hashicorp/google v3.90.1
+ provider registry.terraform.io/hashicorp/google-beta v3.90.1
+ provider registry.terraform.io/hashicorp/null v2.1.2
+ provider registry.terraform.io/hashicorp/random v2.3.1

Additional information

I understand that the terraform registry for the resource allows a list of different formats for source_image, but it uses source image if neither source_image_family or source_image_project are used. If I'm using source_image in this module, would the source_image_project still have to be used? If it's left null, then it defaults to centos-cloud. The registry examples use "source_image = "debian-cloud/debian-9", so that format wouldn't be consistent for this variable

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