Open ports on Windows server using PS

Question

I am using the following code to open a port on a Windows server so I can perform port checks to and from this server:

   function Listen-Port ($port=80){  
   <#  
   .DESCRIPTION  
   Temporarily listen on a given port for connections dumps connections to the screen - useful for troubleshooting  
   firewall rules.  

   .PARAMETER Port  
   The TCP port that the listener should attach to  

   .EXAMPLE  
   PS C:\> listen-port 443  
   Listening on port 443, press CTRL+C to cancel  

   DateTime                                      AddressFamily Address                                                Port  
   \--------                                      ------------- -------                                                ----  
   3/1/2016 4:36:43 AM                            InterNetwork 192.168.20.179                                        62286  
   Listener Closed Safely  

   .INFO  
   Created by Shane Wright. Neossian@gmail.com  

   #>  
       $endpoint = new-object System.Net.IPEndPoint ([system.net.ipaddress]::any, $port)      
       $listener = new-object System.Net.Sockets.TcpListener $endpoint  
       $listener.server.ReceiveTimeout = 3000  
       $listener.start()      
       try {  
       Write-Host "Listening on port $port, press CTRL+C to cancel"  
       While ($true){  
           if (!$listener.Pending())  
           {  
               Start-Sleep -Seconds 1;   
               continue;   
           }  
           $client = $listener.AcceptTcpClient()  
           $client.client.RemoteEndPoint | Add-Member -NotePropertyName DateTime -NotePropertyValue (get-date) -PassThru  
           $client.close()  
           }  
       }  
       catch {  
           Write-Error $_            
       }  
       finally{  
               $listener.stop()  
               Write-host "Listener Closed Safely"  
       }  

   }  

After consecutive connections the output looks like this:

DateTime AddressFamily Address Port

---

16/09/2022 12:48:28 PM InterNetwork 127.0.0.1 55473
16/09/2022 12:49:06 PM InterNetwork 127.0.0.1 55618
16/09/2022 12:49:30 PM InterNetwork 127.0.0.1 55696

And this is what I expected. So far so good.

The only problem is that the first time the code is run, with the first connection to the port, I can see the cursor drop one line, however nothing is displayed. I close that connection and connect again, and then both the previous and new connection details are displayed.

The output comes from the "$client.client.RemoteEndPoint | Add-Member...." line. It seems the connection is "saved" to this variable but not displayed until a second connection occurs.

Any suggestions on how to fix this?