немного изменена логика работы TransmittedSharedObject, получается теперь, работает даже быстрее

mROA/Implementation/Backend/JsonSerialisationModule.cs

@@ -41,9 +41,7 @@ public class JsonSerialisationModule : ISerialisationModule
 
     public void PostResponse(NetworkMessage message, int clientId)
     {
-        var texted = JsonSerializer.Serialize(message);
-        var binary = Encoding.UTF8.GetBytes(texted);
-        _dataSource!.SendTo(clientId, binary);
+        _dataSource!.SendTo(clientId, JsonSerializer.SerializeToUtf8Bytes(message));
     }
 
     public void Inject<T>(T dependency)

mROA/Implementation/TransmittedSharedObject.cs

@@ -14,21 +14,33 @@ public class TransmittedSharedObject<T> where T : notnull
                                                                        throw new NullReferenceException(
                                                                            "DefaultContextRepository was not defined");
 
+    private int _contextId = -1;
+
     // ReSharper disable once MemberCanBePrivate.Global
-    public int ContextId { get; init; } = -1;
+    public int ContextId
+    {
+        get => _contextId;
+        init
+        {
+            _contextId = value;
+            Value = GetDefaultContextRepository().GetObject<T>(_contextId)!;
+        }
+    }
 
     [JsonIgnore]
-    public T? Value => GetDefaultContextRepository().GetObject<T>(ContextId);
+    public T Value { get; private set; }
 
     public TransmittedSharedObject()
     {
     }
+    // ReSharper disable once UnusedMember.Global
     public TransmittedSharedObject(T value) 
     {
-        ContextId = GetDefaultContextRepository().GetObjectIndex(value);
+        Value = value;
+        _contextId = GetDefaultContextRepository().GetObjectIndex(value);
     }
 
-    public static implicit operator T(TransmittedSharedObject<T> value) => value.Value!;
+    public static implicit operator T(TransmittedSharedObject<T> value) => value.Value;
 
     public static implicit operator TransmittedSharedObject<T>(T value) =>
         new() { ContextId = GetDefaultContextRepository().GetObjectIndex(value) };