Updated TwistChain step0 and scene.

Disabled LightBaking in TwistChain scenes.

Assets/Constraints/TwistChain.cs

 
         void IAnimationJobData.SetDefaultValues()
         {
-            // Default values.
-            root = null;
-            tip = null;
-
-            rootTarget = null;
-            tipTarget = null;
-
+            root = tip = rootTarget = tipTarget = null;
             curve = AnimationCurve.Linear(0f, 0f, 1f, 1f);
         }
     }

Assets/Constraints/TwistChainStep0.cs

     [Unity.Burst.BurstCompile]
     public struct TwistChainStep0Job : IWeightedAnimationJob
     {
+        public NativeArray<ReadWriteTransformHandle> chain;
+        public ReadWriteTransformHandle rootTarget;
+        public ReadWriteTransformHandle tipTarget;
+
         public FloatProperty jobWeight { get; set; }
 
         public void ProcessRootMotion(AnimationStream stream) {}
     [System.Serializable]
     public struct TwistChainStep0Data : IAnimationJobData
     {
-        bool IAnimationJobData.IsValid() => true;
+        public Transform root;
+        public Transform tip;
+
+        [SyncSceneToStream] public Transform rootTarget;
+        [SyncSceneToStream] public Transform tipTarget;
+
+        bool IAnimationJobData.IsValid() => !(root == null || tip == null || !tip.IsChildOf(root) || rootTarget == null || tipTarget == null);
+            root = tip = rootTarget = tipTarget = null;
         }
     }
 

Assets/Constraints/TwistChainStep1.cs

 
         void IAnimationJobData.SetDefaultValues()
         {
-            // Default values.
-            root = null;
-            tip = null;
-
-            rootTarget = null;
-            tipTarget = null;
+            root = tip = rootTarget = tipTarget = null;
         }
     }
 

Assets/Scenes/TwistChainStep0.unity

   m_ReflectionIntensity: 1
   m_CustomReflection: {fileID: 0}
   m_Sun: {fileID: 2138677392}
-  m_IndirectSpecularColor: {r: 0.28502664, g: 0.37139288, b: 0.4960104, a: 1}
+  m_IndirectSpecularColor: {r: 0, g: 0, b: 0, a: 1}
-  m_GIWorkflowMode: 0
+  m_GIWorkflowMode: 1
   m_GISettings:
     serializedVersion: 2
     m_BounceScale: 1
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 212552605}
-  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 7.484589, y: -0.20891471, z: -0.3319864}
+  m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
+  m_LocalPosition: {x: 7.500002, y: 0, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 1799980151}
   m_Name: 
   m_EditorClassIdentifier: 
   m_Weight: 1
-  m_Effectors: []
+  m_Effectors:
+  - m_Transform: {fileID: 854090494}
+    m_Style:
+      shape: {fileID: 4300000, guid: 687b70eb9c49243639f9379f6965034f, type: 2}
+      color: {r: 1, g: 0, b: 0, a: 0.5}
+      size: 1.13
+      position: {x: 0, y: 0, z: 0}
+      rotation: {x: 0, y: 0, z: 0}
+    m_Visible: 1
+  - m_Transform: {fileID: 212552606}
+    m_Style:
+      shape: {fileID: 4300000, guid: 687b70eb9c49243639f9379f6965034f, type: 2}
+      color: {r: 1, g: 0, b: 0, a: 0.5}
+      size: 1.13
+      position: {x: 0, y: 0, z: 0}
+      rotation: {x: 0, y: 0, z: 0}
+    m_Visible: 1
 --- !u!4 &404418314
 Transform:
   m_ObjectHideFlags: 0
   m_Name: 
   m_EditorClassIdentifier: 
   m_Weight: 1
+  m_Data:
+    root: {fileID: 376328609}
+    tip: {fileID: 184886312}
+    rootTarget: {fileID: 854090494}
+    tipTarget: {fileID: 212552606}
 --- !u!1 &1849984684
 GameObject:
   m_ObjectHideFlags: 0

Assets/Scenes/TwistChainStep1.unity

 LightmapSettings:
   m_ObjectHideFlags: 0
   serializedVersion: 11
-  m_GIWorkflowMode: 0
+  m_GIWorkflowMode: 1
   m_GISettings:
     serializedVersion: 2
     m_BounceScale: 1

Assets/Scenes/TwistChainStep2.unity

 LightmapSettings:
   m_ObjectHideFlags: 0
   serializedVersion: 11
-  m_GIWorkflowMode: 0
+  m_GIWorkflowMode: 1
   m_GISettings:
     serializedVersion: 2
     m_BounceScale: 1

Assets/Scenes/TwistChainStep3.unity

 LightmapSettings:
   m_ObjectHideFlags: 0
   serializedVersion: 11
-  m_GIWorkflowMode: 0
+  m_GIWorkflowMode: 1
   m_GISettings:
     serializedVersion: 2
     m_BounceScale: 1