diff --git a/Patches/Ceciler.JsonExtensionData/JsonExtensionDataPatch.cs b/Patches/Ceciler.JsonExtensionData/JsonExtensionDataPatch.cs
index 847914f5..fa88ce30 100644
--- a/Patches/Ceciler.JsonExtensionData/JsonExtensionDataPatch.cs
+++ b/Patches/Ceciler.JsonExtensionData/JsonExtensionDataPatch.cs
@@ -1,4 +1,4 @@
-using Ceciler.Interfaces;
+using Ceciler.Interfaces;
 using Mono.Cecil;
 using Mono.Cecil.Cil;
 using Mono.Cecil.Rocks;
@@ -17,9 +17,7 @@ public class JsonExtensionDataPatch : IPatcher
     public void Patch(AssemblyDefinition assembly)
     {
         _dictionaryStringObjectReference ??= assembly.MainModule.ImportReference(typeof(Dictionary<string, object>));
-        _dictionaryStringObjectCtorReference ??= assembly.MainModule.ImportReference(
-            typeof(Dictionary<string, object>).GetConstructor(Type.EmptyTypes)
-        );
+        _dictionaryStringObjectCtorReference ??= assembly.MainModule.ImportReference(typeof(Dictionary<string, object>).GetConstructor(Type.EmptyTypes));
 
         if (_jsonExtensionDataAttributeReference is null)
         {
@@ -40,46 +38,50 @@ public class JsonExtensionDataPatch : IPatcher
 
             _jsonIgnoreAttributeReference = assembly.MainModule.ImportReference(jsonIgnoreConstructorReference);
         }
-        var isExternalInitType = assembly.MainModule.ImportReference(typeof(System.Runtime.CompilerServices.IsExternalInit));
+        var isExternalInitType = assembly.MainModule.ImportReference(
+            typeof(System.Runtime.CompilerServices.IsExternalInit)
+        );
 
         var compilerGenerated = assembly.MainModule.ImportReference(
             assembly.MainModule.ImportReference(
-                typeof(System.Runtime.CompilerServices.CompilerGeneratedAttribute).GetConstructor(Type.EmptyTypes)
-            )
-        );
+                typeof(System.Runtime.CompilerServices.CompilerGeneratedAttribute).GetConstructor(Type.EmptyTypes)));
+
+        var nullableAttrType = assembly.MainModule.ImportReference(typeof(System.Runtime.CompilerServices.NullableAttribute));
+        var attrCtor = assembly.MainModule.ImportReference(nullableAttrType.Resolve().Methods.First(m => m.IsConstructor && m.Parameters.Count == 1 && m.Parameters[0].ParameterType.Name == "Byte"));
+        var attr = new CustomAttribute(attrCtor);
+        attr.ConstructorArguments.Add(new CustomAttributeArgument(assembly.MainModule.TypeSystem.Byte, (byte)1));
 
         var processed = new HashSet<string>();
         foreach (var typeDefinition in assembly.MainModule.Types)
         {
-            if (
-                !typeDefinition.Namespace.Contains("SPTarkov.Server.Core.Models")
-                || typeDefinition.IsInterface
-                || typeDefinition.IsEnum
-                || IsStaticClass(typeDefinition)
-                || processed.Contains(typeDefinition.FullName)
-            )
+
+            if (!typeDefinition.Namespace.Contains("SPTarkov.Server.Core.Models") ||
+                typeDefinition.IsInterface ||
+                typeDefinition.IsEnum ||
+                IsStaticClass(typeDefinition) ||
+                processed.Contains(typeDefinition.FullName))
             {
                 continue;
             }
 
             var propertyDefinition = new PropertyDefinition("ExtensionData", PropertyAttributes.None, _dictionaryStringObjectReference);
             propertyDefinition.CustomAttributes.Add(new CustomAttribute(_jsonExtensionDataAttributeReference));
+            propertyDefinition.CustomAttributes.Add(attr);
 
             // Add backing field
-            var field = new FieldDefinition(
-                "<ExtensionData>k__BackingField",
+            var field = new FieldDefinition("<ExtensionData>k__BackingField",
                 FieldAttributes.Private | FieldAttributes.InitOnly,
-                _dictionaryStringObjectReference
-            );
+                _dictionaryStringObjectReference);
             field.CustomAttributes.Add(new CustomAttribute(compilerGenerated));
+            field.CustomAttributes.Add(attr);
             typeDefinition.Fields.Add(field);
 
             // Add getter
             var get = new MethodDefinition(
                 "get_ExtensionData",
                 MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig,
-                _dictionaryStringObjectReference
-            );
+                _dictionaryStringObjectReference);
+
             get.CustomAttributes.Add(new CustomAttribute(compilerGenerated));
             get.Body.Instructions.Add(Instruction.Create(OpCodes.Ldarg_0));
             get.Body.Instructions.Add(Instruction.Create(OpCodes.Ldfld, field));
@@ -136,7 +138,9 @@ public class JsonExtensionDataPatch : IPatcher
 
     private bool IsStaticClass(TypeDefinition type)
     {
-        return type.IsClass && type.IsAbstract && type.IsSealed;
+        return type.IsClass &&
+               type.IsAbstract &&
+               type.IsSealed;
     }
 
     public string Name