diff --git a/com.unity.cinemachine/Runtime/Behaviours/CinemachineClearShot.cs b/com.unity.cinemachine/Runtime/Behaviours/CinemachineClearShot.cs
index ece596764..fad6650d9 100644
--- a/com.unity.cinemachine/Runtime/Behaviours/CinemachineClearShot.cs
+++ b/com.unity.cinemachine/Runtime/Behaviours/CinemachineClearShot.cs
@@ -45,8 +45,8 @@ public class CinemachineClearShot : CinemachineCameraManagerBase
         [FormerlySerializedAs("m_RandomizeChoice")]
         public bool RandomizeChoice = false;
 
-        [SerializeField, HideInInspector, FormerlySerializedAs("m_LookAt")] Transform m_LegacyLookAt;
-        [SerializeField, HideInInspector, FormerlySerializedAs("m_Follow")] Transform m_LegacyFollow;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("m_LookAt")] Transform m_LegacyLookAt;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("m_Follow")] Transform m_LegacyFollow;
 
         float m_ActivationTime = 0;
         float m_PendingActivationTime = 0;
diff --git a/com.unity.cinemachine/Runtime/Behaviours/CinemachineConfiner2D.cs b/com.unity.cinemachine/Runtime/Behaviours/CinemachineConfiner2D.cs
index ac88bb7c2..e7678126d 100644
--- a/com.unity.cinemachine/Runtime/Behaviours/CinemachineConfiner2D.cs
+++ b/com.unity.cinemachine/Runtime/Behaviours/CinemachineConfiner2D.cs
@@ -124,7 +124,7 @@ class VcamExtraState : VcamExtraStateBase
         List<VcamExtraState> m_ExtraStateCache;
         ShapeCache m_ShapeCache;
         
-        [SerializeField, HideInInspector, FormerlySerializedAs("m_MaxWindowSize")]
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("m_MaxWindowSize")]
         float m_LegacyMaxWindowSize = -2; // -2 means there's no legacy upgrade to do
 
         const float k_CornerAngleThreshold = 10f;
diff --git a/com.unity.cinemachine/Runtime/Behaviours/CinemachineSequencerCamera.cs b/com.unity.cinemachine/Runtime/Behaviours/CinemachineSequencerCamera.cs
index 5a123a424..852ae6f1b 100644
--- a/com.unity.cinemachine/Runtime/Behaviours/CinemachineSequencerCamera.cs
+++ b/com.unity.cinemachine/Runtime/Behaviours/CinemachineSequencerCamera.cs
@@ -53,8 +53,8 @@ public struct Instruction
         [FormerlySerializedAs("m_Instructions")]
         public List<Instruction> Instructions = new ();
 
-        [SerializeField, HideInInspector, FormerlySerializedAs("m_LookAt")] Transform m_LegacyLookAt;
-        [SerializeField, HideInInspector, FormerlySerializedAs("m_Follow")] Transform m_LegacyFollow;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("m_LookAt")] Transform m_LegacyLookAt;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("m_Follow")] Transform m_LegacyFollow;
 
         float m_ActivationTime = -1; // The time at which the current instruction went live
         int m_CurrentInstruction = 0;
diff --git a/com.unity.cinemachine/Runtime/Behaviours/CinemachineSplineCart.cs b/com.unity.cinemachine/Runtime/Behaviours/CinemachineSplineCart.cs
index b4c31430a..5761c773f 100644
--- a/com.unity.cinemachine/Runtime/Behaviours/CinemachineSplineCart.cs
+++ b/com.unity.cinemachine/Runtime/Behaviours/CinemachineSplineCart.cs
@@ -77,9 +77,9 @@ public PathIndexUnit PositionUnits
 
 
         // In-editor only: CM 3.0.x Legacy support =================================
-        [SerializeField, HideInInspector, FormerlySerializedAs("SplinePosition")] private float m_LegacyPosition = -1;
-        [SerializeField, HideInInspector, FormerlySerializedAs("PositionUnits")] private PathIndexUnit m_LegacyUnits;
-        [SerializeField, HideInInspector, FormerlySerializedAs("Spline")] private SplineContainer m_LegacySpline;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("SplinePosition")] private float m_LegacyPosition = -1;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("PositionUnits")] private PathIndexUnit m_LegacyUnits;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("Spline")] private SplineContainer m_LegacySpline;
         void PerformLegacyUpgrade()
         {
             if (m_LegacyPosition != -1)
diff --git a/com.unity.cinemachine/Runtime/Behaviours/CinemachineStateDrivenCamera.cs b/com.unity.cinemachine/Runtime/Behaviours/CinemachineStateDrivenCamera.cs
index 169e2e400..8cc9b3c23 100644
--- a/com.unity.cinemachine/Runtime/Behaviours/CinemachineStateDrivenCamera.cs
+++ b/com.unity.cinemachine/Runtime/Behaviours/CinemachineStateDrivenCamera.cs
@@ -81,7 +81,7 @@ internal struct ParentHash
             public int HashOfParent;
         }
         /// <summary>Internal API for the Inspector editor</summary>
-        [HideInInspector][SerializeField] private List<ParentHash> HashOfParent = new();
+        [HideInInspector, SerializeField, NoSaveDuringPlay] private List<ParentHash> HashOfParent = new();
 
         /// <summary>Internal API for the Inspector editor</summary>
         internal void SetParentHash(List<ParentHash> list)
@@ -90,8 +90,8 @@ internal void SetParentHash(List<ParentHash> list)
             HashOfParent.AddRange(list);
         }
 
-        [SerializeField, HideInInspector, FormerlySerializedAs("m_LookAt")] Transform m_LegacyLookAt;
-        [SerializeField, HideInInspector, FormerlySerializedAs("m_Follow")] Transform m_LegacyFollow;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("m_LookAt")] Transform m_LegacyLookAt;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("m_Follow")] Transform m_LegacyFollow;
 
         float m_ActivationTime = 0;
         int m_ActiveInstructionIndex;
diff --git a/com.unity.cinemachine/Runtime/Behaviours/CinemachineTargetGroup.cs b/com.unity.cinemachine/Runtime/Behaviours/CinemachineTargetGroup.cs
index 7a3e57f73..a7a899ed9 100644
--- a/com.unity.cinemachine/Runtime/Behaviours/CinemachineTargetGroup.cs
+++ b/com.unity.cinemachine/Runtime/Behaviours/CinemachineTargetGroup.cs
@@ -174,7 +174,7 @@ void Reset()
         //============================================
         // Legacy support 
 
-        [HideInInspector, SerializeField, FormerlySerializedAs("m_Targets")]
+        [HideInInspector, SerializeField, NoSaveDuringPlay, FormerlySerializedAs("m_Targets")]
         Target[] m_LegacyTargets;
 
         void Awake()
diff --git a/com.unity.cinemachine/Runtime/Components/CinemachineSplineDolly.cs b/com.unity.cinemachine/Runtime/Components/CinemachineSplineDolly.cs
index c24c14d10..c61279a89 100644
--- a/com.unity.cinemachine/Runtime/Components/CinemachineSplineDolly.cs
+++ b/com.unity.cinemachine/Runtime/Components/CinemachineSplineDolly.cs
@@ -113,9 +113,9 @@ public struct DampingSettings
         CinemachineSplineRoll.RollCache m_RollCache;
 
         // In-editor only: CM 3.0.x Legacy support =================================
-        [SerializeField, HideInInspector, FormerlySerializedAs("CameraPosition")] private float m_LegacyPosition = -1;
-        [SerializeField, HideInInspector, FormerlySerializedAs("PositionUnits")] private PathIndexUnit m_LegacyUnits;
-        [SerializeField, HideInInspector, FormerlySerializedAs("Spline")] private SplineContainer m_LegacySpline;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("CameraPosition")] private float m_LegacyPosition = -1;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("PositionUnits")] private PathIndexUnit m_LegacyUnits;
+        [SerializeField, HideInInspector, NoSaveDuringPlay, FormerlySerializedAs("Spline")] private SplineContainer m_LegacySpline;
         void PerformLegacyUpgrade()
         {
             if (m_LegacyPosition != -1)
diff --git a/com.unity.cinemachine/Runtime/Core/CinemachineVirtualCameraBase.cs b/com.unity.cinemachine/Runtime/Core/CinemachineVirtualCameraBase.cs
index afc5cdaa9..73d41a8a2 100644
--- a/com.unity.cinemachine/Runtime/Core/CinemachineVirtualCameraBase.cs
+++ b/com.unity.cinemachine/Runtime/Core/CinemachineVirtualCameraBase.cs
@@ -162,7 +162,7 @@ internal protected virtual void PerformLegacyUpgrade(int streamedVersion)
             }
         }
 
-        [HideInInspector, SerializeField, FormerlySerializedAs("m_Priority")]
+        [HideInInspector, SerializeField, NoSaveDuringPlay, FormerlySerializedAs("m_Priority")]
         int m_LegacyPriority = 0;
 
         //============================================================================
diff --git a/com.unity.cinemachine/Runtime/Impulse/CinemachineImpulseListener.cs b/com.unity.cinemachine/Runtime/Impulse/CinemachineImpulseListener.cs
index 879d4eed5..2f39439e5 100644
--- a/com.unity.cinemachine/Runtime/Impulse/CinemachineImpulseListener.cs
+++ b/com.unity.cinemachine/Runtime/Impulse/CinemachineImpulseListener.cs
@@ -99,7 +99,7 @@ public struct ImpulseReaction
 
             bool m_Initialized;
 
-            [SerializeField, HideInInspector]
+            [SerializeField, HideInInspector, NoSaveDuringPlay]
             Vector3 m_NoiseOffsets;
 
             /// <summary>Generate a new random seed</summary>
diff --git a/com.unity.cinemachine/Runtime/PostProcessing/CinemachineAutoFocus.cs b/com.unity.cinemachine/Runtime/PostProcessing/CinemachineAutoFocus.cs
index e800a6ff2..8a4d30560 100644
--- a/com.unity.cinemachine/Runtime/PostProcessing/CinemachineAutoFocus.cs
+++ b/com.unity.cinemachine/Runtime/PostProcessing/CinemachineAutoFocus.cs
@@ -77,7 +77,7 @@ public enum FocusTrackingMode
         CustomPassVolume m_CustomPassVolume;
 
         /// <summary>Serialized so that the compute shader is included in the build.</summary>
-        [SerializeField]
+        [SerializeField, NoSaveDuringPlay]
         ComputeShader m_ComputeShader;
 
         void OnDisable()