ParameterBindingArgumentTransformationException When using Copy-Item -ToSession

Steps to reproduce

Running this script.

$servers = "IP1", "IP2"

$sessions = New-PSSession -HostName $servers -UserName Administrator

Invoke-Command $sessions {
    Remove-Item -Force -Recurse "C:\EdgeDriver" -ErrorAction SilentlyContinue
    New-Item -ItemType Directory "C:\EdgeDriver" | Out-Null
}

foreach ($session in $sessions) {
    Copy-Item "C:/Users/redacted/Downloads/MicrosoftWebDriver.exe" "C:\EdgeDriver\MicrosoftWebDriver.exe" -ToSession $session
}

Get-PSSession | Remove-PSSession

The target servers are running:

• Windows Server 2016 14393.2580
• OpenSSH v7.7.2.0p1-Beta (sshd is running on desktop, these are automated testing nodes)
• PowerShellCore 6.2.0-preview.1 (MSI package)

Expected behavior

File is copied with no errors.

Actual behavior

File is copied but the following error shows for every session.

Copy-Item : Cannot process argument transformation on parameter 'Encoding'. 'Byte' is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.
Parameter name: name
At C:\Users\redacted\Desktop\webdriver.ps1:9 char:5
+     Copy-Item "C:/Users/redacted/Downloads/MicrosoftWebDriver.exe" "C ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [Write-Error], ParameterBindin...mationException
+ FullyQualifiedErrorId : System.Management.Automation.ParameterBindingArgumentTransformationException,PSCopyFileAlternateStreamToRemoteSession

Copy-Item : Failed to copy file C:\Users\redacted\Downloads\MicrosoftWebDriver.exe to remote target destination.
At C:\Users\redacted\Desktop\webdriver.ps1:9 char:5
+     Copy-Item "C:/Users/redacted/Downloads/MicrosoftWebDriver.exe" "C ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : WriteError: (C:\Users\redact...ftWebDriver.exe:String) [Copy-Item], IOException
+ FullyQualifiedErrorId : CopyError,Microsoft.PowerShell.Commands.CopyItemCommand

Environment data

Version on the workstation.

PSVersion                      6.2.0-preview.1
PSEdition                      Core
GitCommitId                    6.2.0-preview.1
OS                             Microsoft Windows 10.0.17134
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Start by running the provided Copy-Item -ToSession reproduction and then trace the command's remote-copy and Encoding parameter-binding paths. The fix is complete when copying the executable to each PSSession produces no encoding or copy errors, with regression coverage added wherever the existing Copy-Item tests cover this behavior.