Resolved - PowerShell script only works in Console, but not in ISE?

I'd like to collect workflow information from SPO. But the script below only works in Console, not in ISE.

$WfServicesManager = New-Object Microsoft.SharePoint.Client.WorkflowServices.WorkflowServicesManager($ctx,$Web)

The error message: Cannot find an overload for "WorkflowServicesManager" and the argument count: "2"

Below is how I did the trouble shooting.

1. Compare the PowerShell environment version information.

$PSVersionTable shows everything is same in Console and ISE.

2. Make sure the class exist in both environment.

$ClassName = "Microsoft.SharePoint.Client.WorkflowServices.WorkflowServicesManager"
if ($ClassName -as [type]) {
"$ClassName is already loaded"
}
else{
"$ClassName is not loaded"
}

Yes, the class is loaded.

3. Check how many relevant assemblies are loaded.

[appdomain]::currentdomain.getassemblies() | ?{$_.CodeBase -match "WorkflowServices"}

Here I noticed that ISE loaded a PnP assembly which also contains "Microsoft.SharePoint.Client.WorkflowServices.WorkflowServicesManager"

Obviously this is the root cause.

I think this is caused by old version PnP, so just removed/uninstalled these assemblies first.

Uninstall-Module SharePointPnPPowerShellOnline -AllVersions -Confirm

Then reinstalled the latest version.

Done.