Run PowerShell 7 in the ISE

PS7ISE.ps1

$psISE.CurrentPowerShellTab.AddOnsMenu.Submenus.Clear()
$psISE.CurrentPowerShellTab.AddOnsMenu.Submenus.Add("Switch to PowerShell 7", { 
        function New-OutOfProcRunspace {
            param($ProcessId)

            $ci = New-Object -TypeName System.Management.Automation.Runspaces.NamedPipeConnectionInfo -ArgumentList @($ProcessId)
            $tt = [System.Management.Automation.Runspaces.TypeTable]::LoadDefaultTypeFiles()

            $Runspace = [System.Management.Automation.Runspaces.RunspaceFactory]::CreateRunspace($ci, $Host, $tt)

            $Runspace.Open()
            $Runspace
        }

        $PowerShell = Start-Process PWSH -ArgumentList @("-NoExit") -PassThru -WindowStyle Hidden
        $Runspace = New-OutOfProcRunspace -ProcessId $PowerShell.Id
        $Host.PushRunspace($Runspace)
}, "ALT+F5") | Out-Null

$psISE.CurrentPowerShellTab.AddOnsMenu.Submenus.Add("Switch to Windows PowerShell", { 
    $Host.PopRunspace()

    $Child = Get-CimInstance -ClassName win32_process | where {$_.ParentProcessId -eq $Pid}
    $Child | ForEach-Object { Stop-Process -Id $_.ProcessId }

}, "ALT+F6") | Out-Null

I continue to receive the error:

MethodInvocationException: 
Line |
  16 |          $Host.PushRunspace($Runspace)
     |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Exception calling "PushRunspace" with "1" argument(s): "Specified method is not supported."

when I use the "Add-ons" > "Switch to PowerShell 7"

is there an expectation that this is a "known issue"?

I have the same problem like noeffort3

I get the same error after running PushRunspace.
But running the PS7ISE.ps1 in a clean PowerShell ISE elevated session does not throw any erros. But using the swithing from the 'Add-ons' menu(ALT-F5) afterwards, gives me the following error popup. Using $PSversiontable does show me version 7.0.3 though and the help menu seems to switch as well.

Same as @Floriszz