{{.ArtifactId}} is not defined in parallel build

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Overview of the Issue

When using the vagrant post-processer on boxes built through parrallel builds there is no real {{.ArtifactId}} for boxes built with the virtualbox plugin but there is for boxes built with the vmware plugin.

For virtualbox builds the {{.ArtifactId}} is not present in the manifest.

For vmware builds the {{.ArtifactId}} is the vm_name.

Why is this an issue?

Vagrant post-processor defaults to using {{.BuildName}} in output, {{.BuildName}} ends up being the top level template, "virtualbox-iso.default" or "vmware-iso.default" in this case, a unique output name is required to run multiple builds through the Vagrant post-processor without overwriting the previous.

Reproduction Steps

With Simplified Packer Template

For packer build -only=roles.virtualbox-iso.1 .

artifact_id is VM in the manifest

output/packer-manifest.json

...
      "artifact_id": "VM",
...

Vagrant outputs box to "output/VM.box"

For packer build -only=roles.vmware-iso.1 .

the artifact_id is the vm_name in the manifest

output/packer-manifest.json

...
      "artifact_id": "vmware-box1",
...

Vagrant outputs box to "output/vmware-box1.box"

{{.ArtifactId} should reflect the vm_name as the vmware plugin does so this can be used to uniquely name outputted boxes.

Packer version

Packer v1.8.3
packer-plugin-virtualbox_v1.0.4_x5.0_darwin_amd64
packer-plugin-vmware_v1.0.7_x5.0_darwin_amd64

Simplified Packer Template

Attempted to simplify as much as possible.

source "virtualbox-iso" "default" {
  cpus = "${var.cpus}"
  disk_size  = "${var.disk_size}"
  memory  = "${var.memory}"
  "{{  Other Common Parameters }}"
}
source "vmware-iso" "default" {
  cpus = "${var.cpus}"
  disk_size  = "${var.disk_size}"
  memory  = "${var.memory}"
  "{{ Other Common Parameters }}"
}
build {
  name = "roles"
  source "virtualbox-iso.1" {
    vm_name: virtualbox-box1
   "{{ VirtualBox-1 Specific Parameters }}"
  }
  source "virtualbox-iso.2" {
    vm_name: virtualbox-box2
    "{{ VirtualBox-2 Specific Parameters }}"
  }
  source "vmware-iso.1" {
    vm_name: vmware-box1
    "{{ VMWare-1 Specific Parameters }}"
  }
  source "vmware-iso.2" {
    vm_name: vmware-box2
    "{{ VMWare-2 Specific Parameters }}"
  }
  post-processor "manifest" {
  }
  post-processor "vagrant" {
    output = "output/{{.ArtifactId}}.box"
  }
}

Operating system and Environment details

MacOS Monterey Version 12.5 (Intel Processor)

Log Fragments and crash.log files

N/A