Cannot access SMB server in PowerShell inmmediately after successful access to it

Question

It's explained better viewing the console:

[ COMMENTS PRECEDED WITH DOUBLE # ]

Windows PowerShell
Copyright (C) Microsoft Corporation. All rights reserved.

## \\zx0\intranet mounts in drive B: via Group Policy
## \\zx0\home mounts in drive A: via Group Policy
## (This a Windows Server 2019 no desktop machine. Only PowerShell, even via RDP)
## Accessing this server using Enter-PSSession does not have the mounts A: and B: but they
## can be mounted using New-SmbMapping. Accessing this via RDP doesn't allow mounting them
## They can be accessed simply with Set-Location but just once.

PS C:\Windows\system32> B:
Set-Location : Cannot find drive. A drive with the name 'B' does not exist.
At line:1 char:1
+ Set-Location $MyInvocation.MyCommand.Name
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (B:String) [Set-Location], DriveNotFoundException
    + FullyQualifiedErrorId : DriveNotFound,Microsoft.PowerShell.Commands.SetLocationCommand

PS C:\Windows\system32> New-SmbMapping -LocalPath B: -RemotePath \\zx0\intranet
New-SmbMapping : Access is denied.
At line:1 char:1
+ New-SmbMapping -LocalPath B: -RemotePath \\zx0\intranet
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : PermissionDenied: (MSFT_SmbMapping:ROOT/Microsoft/...MSFT_SmbMapping) [New-SmbMapping],
   CimException
    + FullyQualifiedErrorId : Windows System Error 5,New-SmbMapping

## FIRST ACCESS TO SERVER ZX0 -- SUCCESSFUL
## AUTHENTICATION MADE AUTOMATICALLY VIA KERBEROS -- USING DOMAIN ACCOUNT

PS C:\Windows\system32> cd \\zx0\intranet
PS Microsoft.PowerShell.Core\FileSystem::\\zx0\intranet> cd .\downloads\
PS Microsoft.PowerShell.Core\FileSystem::\\zx0\intranet\downloads> .\WindowsAdminCenter2103.msi /?
PS Microsoft.PowerShell.Core\FileSystem::\\zx0\intranet\downloads> cd Cert:\LocalMachine
PS Cert:\LocalMachine\> cd my
PS Cert:\LocalMachine\my> ls

## SECOND ACCESS TO SERVER ZX0 -- FAILED
## PATH IS DIFFERENT

PS Cert:\LocalMachine\my> cd \\zx0\home\
cd : Cannot find path '\\zx0\home\' because it does not exist.
At line:1 char:1
+ cd \\zx0\home\
+ ~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (\\zx0\home\:String) [Set-Location], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.SetLocationCommand

PS Cert:\LocalMachine\my> cd \\zx0
cd : Cannot find path '\\zx0' because it does not exist.
At line:1 char:1
+ cd \\zx0
+ ~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (\\zx0:String) [Set-Location], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.SetLocationCommand

PS Cert:\LocalMachine\my> \\zx0
\\zx0 : The term '\\zx0' is not recognized as the name of a cmdlet, function, script file, or operable program. Check
the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ \\zx0
+ ~~~~~
    + CategoryInfo          : ObjectNotFound: (\\zx0:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS Cert:\LocalMachine\my> cd \\zx0
cd : Cannot find path '\\zx0' because it does not exist.
At line:1 char:1
+ cd \\zx0
+ ~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (\\zx0:String) [Set-Location], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.SetLocationCommand

## RETRIED PATH OF EARLIER SUCCESSFUL ACCESS
## 

PS Cert:\LocalMachine\my> cd \\zx0\intranet\
cd : Cannot find path '\\zx0\intranet\' because it does not exist.
At line:1 char:1
+ cd \\zx0\intranet\
+ ~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (\\zx0\intranet\:String) [Set-Location], ItemNotFoundException
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.SetLocationCommand

PS Cert:\LocalMachine\my>

Any ideas what's wrong with it?