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Overview of the Issue

I'm trying to leverage shell-local to do some preparation steps before a packer build in my builder, and I'm doing my testing from WSL. According to the example in the docs, I can run a bash script and seemingly use a Linux-style path. However, I receive the following error when I do so:

There was an error splitting your absolute path; expected to find a drive
following the format ':/' but did not: absolute path:
/home/<user>/test/scripts/test.sh

Reproduction Steps

Steps to reproduce this issue:

1. Create a simple packer file using the null source and builder
2. Use a small bash script that echoes a message.
3. Run packer validate . or packer build .

Packer version

Packer v1.10.1

Simplified Packer Template

source "null" "test-shell-local" {
  ssh_host = "127.0.0.1"
  ssh_username = "<user>"
  ssh_password = "<password>"
}

build {
  sources = ["sources.null.test-shell-local"]

  provisioner "shell-local" {
    # Making WSL-friendly
    environment_vars  = ["SHELLLOCALTEST=ShellTest3"]
    execute_command   = ["bash", "-c", "{{.Vars}} {{.Script}}"]
    use_linux_pathing = true
    script            = "./scripts/test.sh"
    }

}

Operating system and Environment details

OS: Windows 11 Pro
Windows Version: 23H2
Windows Build: 22631.3155
WSL2 version: 2.0.9.0
Ubuntu version: 22.04.04

Log Fragments and crash.log files

Error: Failed preparing provisioner-block "shell-local" ""
  on test.pkr.hcl line 10:

  (source code not available)
  on test.pkr.hcl line 10:

  (source code not available)
There was an error splitting your absolute path; expected to find a drive

following the format ':/' but did not: absolute path:
/home/<user>/test/scripts/test.sh

There was an error splitting your absolute path; expected to find a drive
2024/02/17 10:11:54 [INFO] (telemetry) Finalizing.
following the format ':/' but did not: absolute path:
/home/<user>/test/scripts/test.sh