uninstall from offline vhd is not working properly

[jianyunt]

Repro Steps:

Get-Package -Provider NanoServerPackage -FromVhd c:\test\test.vhd
Uninstall-Package -Provider NanoServerPackage -FromVhd c:\test\test.vhd or
Get-Package -Provider NanoServerPackage -FromVhd c:\test\test.vhd | Uninstall-Package
Get-Package -Provider NanoServerPackage -FromVhd c:\test\test.vhd

Result:
the specified package is still listed from the Get-Package after uninstall.