valid box file not generated when using artifacts from 'artifice' post-processor with provider_override="hyperv"

[sup-engineer]

Overview of the Issue

When this post processor is used with artifacts from the 'artifice' post processor along with the provider_override="hyperv", the resulting .box output file does not seem to be valid.

Reproduction Steps

Prerequisite:

1. following Hyper V vm source files :

2. packer with the necessary plugins installed
3. Execute : packer build
   • Expected behaviour: a working vagrant box (.box file) is generated from the hyperv source files
   • Observed behaviour:

     • An incomplete .box file file is generated (see attached file:packer_example_hyperv_amd64.box in the zip file ).
       packer_example_hyperv_amd64.zip

     • No Hyper-v VM artifacts are present in the .box file. It only contains the vagrantfile and the metadata.json. Also the input
       artifacts are being copied to 'c:\users' folder which was not expected behaviour.

Plugin and Packer version

Simplified Packer Buildfile

file: vagrant_post_processor_hyperv.pkr.hcl

  required_plugins {
    vagrant = {
      version = "~> 1"
      source = "github.com/hashicorp/vagrant"
    }
  }
}

source "null" "example" {
  communicator = "none"
}

build {
  sources = [
    "source.null.example"
  ]
  post-processors {
    post-processor "artifice" {
      files = [
        "output-windows10/Virtual Hard Disks/VnV-W10-001.vhdx",
        "output-windows10/Virtual Machines/4643F645-2EDB-4DD5-8E17-18A7DE59893C.vmcx",
        "output-windows10/Virtual Machines/4643F645-2EDB-4DD5-8E17-18A7DE59893C.vmgs",
        "output-windows10/Virtual Machines/4643F645-2EDB-4DD5-8E17-18A7DE59893C.VMRS",
        "output-windows10/Virtual Machines/box.xml"
      ]
    }
    post-processor "vagrant" {
      keep_input_artifact = true
      provider_override   = "hyperv"
    }
  }
}

Operating system and Environment details

Log Fragments and crash.log files

See attached log file from the CMD prompt ( packer_build_logt.txt) for the packer build:

packer_build_logt.txt