Packer returns Powershell Error After Provisioners are complete

#### Overview of the Issue

I am creating a Windows GCP Image and after invoking the GCP Sysprep
```
provisioner "powershell"{
inline = ["GCESysprep -NoShutdown"]
}
```
it returns a weird Powershell error

```
==> googlecompute.vm: . : The term
==> googlecompute.vm: 'c:/Windows/Temp/packer-ps-env-vars-62f10fbc-5827-c4b2-8272-3b1793e96a67.ps1'
==> googlecompute.vm: is not recognized as the name of a cmdlet, function, script file, or operable
==> googlecompute.vm: program. Check the spelling of the name, or if a path was included, verify
==> googlecompute.vm: that the path is correct and try again.
==> googlecompute.vm: At line:1 char:138
==> googlecompute.vm: + ... lyContinue'};.
==> googlecompute.vm: c:/Windows/Temp/packer-ps-env-vars-62f10fbc-5827-c4b2-8272-3b1793 ...
==> googlecompute.vm: +
==> googlecompute.vm: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
==> googlecompute.vm: + CategoryInfo : ObjectNotFound: (c:/Windows/Temp...b1793e96a67.p
==> googlecompute.vm: s1:String) [], CommandNotFoundException
==> googlecompute.vm: + FullyQualifiedErrorId : CommandNotFoundException
```
**NOTE** The image gets built and it works but I would like to get rid of that error

#### Reproduction Steps

**gcp.pkr.hcl**

```hcl
source "googlecompute" "vm" {

...
metadata = {
windows-startup-script-cmd = local.script_cmd
windows-shutdown-script-ps1 = "C:/cleanup-packer.ps1"
}

account_file = var.account_file_path
}
```
**gcp.build.pkr.hcl**

```hcl
build {
sources = ["source.googlecompute.vm"]
provisioner "file" {
source = "./scripts/cleanup-packer.ps1"
destination = "C:/cleanup-packer.ps1"
}

provisioner "powershell"{
inline = ["GCESysprep -NoShutdown"]
}

}
```


### Plugin and Packer version

packer `1.8.3`

The error happened after provisioner `GCPSysPrep -NoShutdown` command is executed but there are not more scripts to be called.