Impossible to set ASN number for a peer router via a VLAN attachment of type "PARTNER"

[AdoHus]

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Description

If you want to provision a partner interconnect connection between Google Cloud and Equinix, you cannot use Terraform to configure the BGP ASN number in Google Cloud as part of the provisioning process.
While using google_compute_interconnect_attachment of the type "PARTNER", a default BGP confiruation is already created which cannot be updated by Terraform. A new functionality must be developed urgently to have the ability to update the ASN number via Terraform, otherwise there is no point in having IaC for Partner Interconnect.
A similar/identical issue (#12630) was raised more than a year ago, but it seems nothing happened ever since.

New or Affected Resource(s)

google_compute_interconnect_attachment

Potential Terraform Configuration

resource "google_compute_interconnect_attachment" "connection-to-partner" {
name ="connection-to-partner"
edge_availability_domain = "AVAILABILITY_DOMAIN_1"
type = "PARTNER"
region = "europe-central2"
router = google_compute_router.test_cloud_router.id
admin_enabled = true
partner_bgp_asn = 47123 ### [New functionality] Sets the ASN number in the automatically provisioned BGP peering setup.
}

References

#12630