Cannot connect to working Websocket Server

Websocket connection requests using the /connect or /wsserver command fail when trying to connect to a local websocket server. The server code has not changed since but suddenly Bedrock cannot connect, "Could not connect to server: ws://localhost:3000"

The issue has been replicated on more than one network using various websocket servers. The following code is a very simple C# websocket server for testing.

using System;
using System.Net;
using System.Net.Sockets;

namespace WebsocketServ
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpListener server = new TcpListener(IPAddress.Parse("127.0.0.1"), 3000);
            server.Start();
            Console.WriteLine("Server has started on 127.0.0.1:3000");
            TcpClient client = server.AcceptTcpClient();
            Console.WriteLine("A client connected.");
        }
    }
}

Attempting to connect in-game produces the "Could not connect to server: ws://localhost:3000" error. Attempting to connect from a test client confirms that the server does accept connections properly.

This server code along with multiple other WSS implementations have all worked previously, but suddenly stopped about a day or two ago. Other users have tested the code as well and have been able to produce the same issue.