Got at least one data fetching method working; turns out, we can't use a patched LogicStack to get the data

Vendor/EmbedIO-3.5.2/WebSockets/Internal/SystemWebSocketReceiveResult.cs

@@ -0,0 +1,29 @@
+namespace EmbedIO.WebSockets.Internal
+{
+    /// <summary>
+    /// Represents a wrapper around a regular WebSocketContext.
+    /// </summary>
+    /// <inheritdoc />
+    internal sealed class SystemWebSocketReceiveResult : IWebSocketReceiveResult
+    {
+        private readonly System.Net.WebSockets.WebSocketReceiveResult _results;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SystemWebSocketReceiveResult"/> class.
+        /// </summary>
+        /// <param name="results">The results.</param>
+        public SystemWebSocketReceiveResult(System.Net.WebSockets.WebSocketReceiveResult results)
+        {
+            _results = results;
+        }
+
+        /// <inheritdoc/>
+        public int Count => _results.Count;
+        
+        /// <inheritdoc/>
+        public bool EndOfMessage=> _results.EndOfMessage;
+        
+        /// <inheritdoc/>
+        public int MessageType => (int) _results.MessageType;
+    }
+}