Failure modifying volume_name in ibm_is_instance_volume_attachment

[jjordana27]

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Terraform CLI and Terraform IBM Provider Version

Terraform v1.0.3 on windows_amd64
provider registry.terraform.io/ibm-cloud/ibm v1.31.0

Affected Resource(s)

• ibm_is_instance_volume_attachment

Terraform Configuration Files

config file:

terraform {
  required_providers {
    ibm = {
      source = "IBM-Cloud/ibm"
      version = ">= 1.12.0"
    }
  }
}

# Configure the IBM Provider
provider "ibm" {
  region = "eu-de"
}

resource "ibm_is_instance" "testacc_instance" {
  resource_group = var.instance.resource_group
  name    = var.instance.name
  image   = var.instance.image
  profile = var.instance.profile
  primary_network_interface {
    subnet = var.instance.primary_network_interface.subnet
    primary_ipv4_address = var.instance.primary_network_interface.primary_ipv4_address
    allow_ip_spoofing = false
  }
  vpc  = var.instance.vpc
  zone = var.instance.zone
  keys = var.instance.keys
}

resource "ibm_is_instance_volume_attachment" "testacc_att1" {
  count = length(var.data_volumes)
  instance = ibm_is_instance.testacc_instance.id
  name = var.data_volumes[count.index].name
  profile = "custom"
  capacity = var.data_volumes[count.index].capacity
  volume_name = var.data_volumes[count.index].volume_name

}

old var:

"data_volumes" : [
        {
            "name" : "test-vol-att-1-45564",
            "capacity" : 50,
            "iops" : 100,
            "volume_name" : "testvol1-45564"
        }
    ]

new var:

"data_volumes" : [
        {
            "name" : "test-vol-att-1-45564",
            "capacity" : 50,
            "iops" : 100,
            "volume_name" : "newname"
        }
    ]

Expected Behavior

The volume_name should have changed

Actual Behavior

The volume_name did not change

Debug Output

This file contains the cmd output and the terraform/provider logs of the issue:

https://gist.github.com/jjordana27/f472a482e607041e8aa819561baa6238