Is there a limitation to [`Get-Acl`](https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.security/get-acl?view=powershell-5.1) in that it doesn't work with mapped drives?

When I run it against `C:\Test`, it works fine. When I run against a mapped drive I get:

```
Get-Acl : Method failed with unexpected error code 50.
At line:1 char:1
+ Get-Acl U:\Themes
+ ~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-Acl], InvalidOperationException
    + FullyQualifiedErrorId : System.InvalidOperationException,Microsoft.PowerShell.Commands.GetAclCommand

```