make ModuleState abstract to avoid trouble with the type of reference to its Module

Assets/Engine/Assets/Prefabs/Generic Module.prefab

@@ -92,7 +92,6 @@ GameObject:
   serializedVersion: 6
   m_Component:
   - component: {fileID: 7860513085978939562}
-  - component: {fileID: 4604142456167599783}
   m_Layer: 0
   m_Name: Generic Module
   m_TagString: Untagged
@@ -116,18 +115,6 @@ Transform:
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
---- !u!114 &4604142456167599783
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 3864228228344123331}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: efdc32c450f7411385748449459a17b4, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
 --- !u!1 &4439105426094897912
 GameObject:
   m_ObjectHideFlags: 0

Assets/Engine/Runtime/Modules/DoorState.cs

@@ -15,7 +15,7 @@ namespace EscapeRoomEngine.Engine.Runtime.Modules
     {
         public event DoorEventHandler DoorEvent;
 
-        private new DoorModule Module { get; set; }
+        private DoorModule Module { get; set; }
         public bool Unlocked
         {
             get => _unlocked;

Assets/Engine/Runtime/Modules/ModuleState.cs

@@ -2,10 +2,8 @@
 
 namespace EscapeRoomEngine.Engine.Runtime.Modules
 {
-    public class ModuleState : MonoBehaviour
+    public abstract class ModuleState : MonoBehaviour
     {
-        public Module Module { get; protected set; }
-
-        public virtual void SetModule(Module module) => Module = module;
+        public abstract void SetModule(Module module);
     }
 }

Assets/Engine/Runtime/Modules/PuzzleState.cs

@@ -33,7 +33,7 @@ namespace EscapeRoomEngine.Engine.Runtime.Modules
         public event PuzzleEventHandler PuzzleEvent;
         public EngineTheme theme;
 
-        private new PuzzleModule Module { get; set; }
+        protected PuzzleModule Module { get; private set; }
         public bool Solved
         {
             get => _solved;