Custom Editor] FindProperty can't find a specific property!,CustomEditor] FindProperty can't find specific object

Hi. I faced really weird problem when i customize editor.

In this script capture, BuffElements buffElementsMoveSlow is missing! all public variables are displayed except BuffElements. Looks all conditions are same but I can't guess why only that variable is not displayed on the editor. please help!

here' s orginal script:

 public class Tower : MonoBehaviour
 {
     //-----------------------------------------------------------
     // Inspectors are controlled by TurretEditor
     //-----------------------------------------------------------
     public enum ProjectileType
     {
         Bullet = 0,
         Laser = 1
     }
 
     private Transform targetTransform;
     private Enemy targetEnemy;
 
     //[Header("General")]
     public float range = 5f;
 
     //[Header("Projectile Type")]
     public ProjectileType projectileType;
 
     //[Header("Projectile Type : Bullet")]
     private float fireCountdown = 0;
     public GameObject bulletPrefab;
     public float fireRate = 0.2f;
 
 
     //[Header("Projectile Type : Laser")]
     public int damageOverTime = 30;
     public float slowPercent = 0.5f;
     public LineRenderer lineRenderer;
     public ParticleSystem laserBeamImpactEffect;
     public Light laserBeamImpactLight;
     public BuffElements buffElementsMoveSlow;
     private Coroutine laserDubffCoroutin;
     //[Header("Unity Setup fields")]
     public string enemyTag = "Enemy";
     public Transform partToRotate;
     public Transform firePoint;
     public float turnSpeed = 10f;
     
     ////////////////////////////////////////////////////////////////
     
     void Start()
     {
         InvokeRepeating("UpdateTarget", 0f, 0.5f);
     }
 .....
 }

This is custom editor script :

 using UnityEditor;
 
 public enum ProjectileType
 {
     
     Bullet = 0,
     Laser = 1
 }
 
 [CanEditMultipleObjects]
 [CustomEditor (typeof(Tower))]
 public class TowerEditor : Editor
 {
     float rangeProperty;
     //[Header("Projectile Type")]
     SerializedProperty projectileTypeProperty;
     //[Header("Projectile Type : Bullet")]
     float fireRateProperty;
     SerializedProperty bulletPrefabProperty;
     //[Header("Projectile Type : Laser")]
     int damageOverTimeProperty;
     float slowPercentProperty;
     SerializedProperty lineRendererProperty;
     SerializedProperty laserBeamImapctEffectProperty;
     SerializedProperty laserBeamImpactLightProperty;
     SerializedProperty buffElementsMoveSlowProperty;
     
     //[Header("Unity Setup fields")]
     string enemyTagProperty;
     SerializedProperty partToRotateProperty;
     SerializedProperty firePointProperty;
     float turnSpeedProperty;    
 
     private void OnEnable()
     {
         rangeProperty = serializedObject.FindProperty("range").floatValue;
         //[Header("Projectile Type : Bullet")]
         fireRateProperty = serializedObject.FindProperty("fireRate").floatValue;
         bulletPrefabProperty = serializedObject.FindProperty("bulletPrefab");
         //[Header("Projectile Type : Laser")]
         damageOverTimeProperty = serializedObject.FindProperty("damageOverTime").intValue;
         slowPercentProperty = serializedObject.FindProperty("slowPercent").floatValue;
         lineRendererProperty = serializedObject.FindProperty("lineRenderer");
         laserBeamImapctEffectProperty = serializedObject.FindProperty("laserBeamImapctEffect");
         laserBeamImpactLightProperty = serializedObject.FindProperty("laserBeamImpactLight");
         buffElementsMoveSlowProperty = serializedObject.FindProperty("buffElementsMoveSlow");
         //[Header("Unity Setup fields")]
         enemyTagProperty = serializedObject.FindProperty("enemyTag").stringValue;
         partToRotateProperty = serializedObject.FindProperty("partToRotate");
         firePointProperty = serializedObject.FindProperty("firePoint");
         turnSpeedProperty = serializedObject.FindProperty("turnSpeed").floatValue;
 
     }
     
     public override void OnInspectorGUI()
     {
         
         serializedObject.Update();
         
         EditorGUILayout.LabelField("[General]");
         EditorGUILayout.FloatField("Explosion Range by :", rangeProperty);
 
         EditorGUILayout.LabelField("[Projectile Type]");
 

         projectileTypeProperty = serializedObject.FindProperty("projectileType");
         EditorGUILayout.PropertyField(projectileTypeProperty);
         ProjectileType projectileType = (ProjectileType)projectileTypeProperty.enumValueIndex;
         
         /////////////////////////////////////////////////////////////////////////////////////////////////////////
 
         switch (projectileType)
         {
             // projectile Bullet 
             case ProjectileType.Bullet:
                 // tower using Bullet 
                 EditorGUILayout.LabelField("[Projectile : Bullet]");
 
                 EditorGUILayout.FloatField("Fire rate (Speed) by :", fireRateProperty);
                 if (bulletPrefabProperty != null)
                     EditorGUILayout.ObjectField(bulletPrefabProperty);
 
                 break;
             // projectile Laser
             case ProjectileType.Laser:
                 // tower using laser
                 EditorGUILayout.LabelField("[Projectile : Laser]");
                 EditorGUILayout.LabelField("Damage Over Time by: ");
                 EditorGUILayout.IntField(" ", damageOverTimeProperty); 
                 EditorGUILayout.FloatField("Slow down by: ", slowPercentProperty);
                 if (lineRendererProperty != null)
                     EditorGUILayout.ObjectField(lineRendererProperty);
                 if (laserBeamImapctEffectProperty != null)
                     EditorGUILayout.ObjectField(laserBeamImapctEffectProperty);
                 if (laserBeamImpactLightProperty != null)
                     EditorGUILayout.ObjectField(laserBeamImpactLightProperty);
                 if (buffElementsMoveSlowProperty != null)
                     EditorGUILayout.ObjectField(buffElementsMoveSlowProperty);  
                 break;
         }
         EditorGUILayout.TextField("Target tag string", enemyTagProperty);
         EditorGUILayout.ObjectField(partToRotateProperty);
         EditorGUILayout.ObjectField(firePointProperty);
         EditorGUILayout.FloatField("Turn speed by: ", turnSpeedProperty);
 
         serializedObject.ApplyModifiedProperties();
         
     }
 }

,Hi. I faced really weird problem when i customize editor. In this script capture, BuffElements buffElementsMoveSlow is missing! all public variables are displayed except BuffElements. Looks all conditions are same but I can't guess why only that variable is not displayed on the editor. please help!

here' s orginal script:

 public class Tower : MonoBehaviour
 {
     //-----------------------------------------------------------
     // Inspectors are controlled by TurretEditor
     //-----------------------------------------------------------
     public enum ProjectileType
     {
         Bullet = 0,
         Laser = 1
     }
 
     private Transform targetTransform;
     private Enemy targetEnemy;
 
     //[Header("General")]
     public float range = 5f;
 
     //[Header("Projectile Type")]
     public ProjectileType projectileType;
 
     //[Header("Projectile Type : Bullet")]
     private float fireCountdown = 0;
     public GameObject bulletPrefab;
     public float fireRate = 0.2f;
 
 
     //[Header("Projectile Type : Laser")]
     public int damageOverTime = 30;
     public float slowPercent = 0.5f;
     public LineRenderer lineRenderer;
     public ParticleSystem laserBeamImpactEffect;
     public Light laserBeamImpactLight;
     public BuffElements buffElementsMoveSlow;
     private Coroutine laserDubffCoroutin;
     //[Header("Unity Setup fields")]
     public string enemyTag = "Enemy";
     public Transform partToRotate;
     public Transform firePoint;
     public float turnSpeed = 10f;
     
     ////////////////////////////////////////////////////////////////
     
     void Start()
     {
         InvokeRepeating("UpdateTarget", 0f, 0.5f);
     }
 .....
 }

This is custom editor script :

 using UnityEditor;
 
 public enum ProjectileType
 {
     
     Bullet = 0,
     Laser = 1
 }
 
 [CanEditMultipleObjects]
 [CustomEditor (typeof(Tower))]
 public class TowerEditor : Editor
 {
     float rangeProperty;
     //[Header("Projectile Type")]
     SerializedProperty projectileTypeProperty;
     //[Header("Projectile Type : Bullet")]
     float fireRateProperty;
     SerializedProperty bulletPrefabProperty;
     //[Header("Projectile Type : Laser")]
     int damageOverTimeProperty;
     float slowPercentProperty;
     SerializedProperty lineRendererProperty;
     SerializedProperty laserBeamImapctEffectProperty;
     SerializedProperty laserBeamImpactLightProperty;
     SerializedProperty buffElementsMoveSlowProperty;
     
     //[Header("Unity Setup fields")]
     string enemyTagProperty;
     SerializedProperty partToRotateProperty;
     SerializedProperty firePointProperty;
     float turnSpeedProperty;    
 
     private void OnEnable()
     {
         rangeProperty = serializedObject.FindProperty("range").floatValue;
         //[Header("Projectile Type : Bullet")]
         fireRateProperty = serializedObject.FindProperty("fireRate").floatValue;
         bulletPrefabProperty = serializedObject.FindProperty("bulletPrefab");
         //[Header("Projectile Type : Laser")]
         damageOverTimeProperty = serializedObject.FindProperty("damageOverTime").intValue;
         slowPercentProperty = serializedObject.FindProperty("slowPercent").floatValue;
         lineRendererProperty = serializedObject.FindProperty("lineRenderer");
         laserBeamImapctEffectProperty = serializedObject.FindProperty("laserBeamImapctEffect");
         laserBeamImpactLightProperty = serializedObject.FindProperty("laserBeamImpactLight");
         buffElementsMoveSlowProperty = serializedObject.FindProperty("buffElementsMoveSlow");
         //[Header("Unity Setup fields")]
         enemyTagProperty = serializedObject.FindProperty("enemyTag").stringValue;
         partToRotateProperty = serializedObject.FindProperty("partToRotate");
         firePointProperty = serializedObject.FindProperty("firePoint");
         turnSpeedProperty = serializedObject.FindProperty("turnSpeed").floatValue;
 
     }
     
     public override void OnInspectorGUI()
     {
         
         serializedObject.Update();
         
         EditorGUILayout.LabelField("[General]");
         EditorGUILayout.FloatField("Explosion Range by :", rangeProperty);
 
         EditorGUILayout.LabelField("[Projectile Type]");
 

         projectileTypeProperty = serializedObject.FindProperty("projectileType");
         EditorGUILayout.PropertyField(projectileTypeProperty);
         ProjectileType projectileType = (ProjectileType)projectileTypeProperty.enumValueIndex;
         
         /////////////////////////////////////////////////////////////////////////////////////////////////////////
 
         switch (projectileType)
         {
             // projectile Bullet 
             case ProjectileType.Bullet:
                 // tower using Bullet 
                 EditorGUILayout.LabelField("[Projectile : Bullet]");
 
                 EditorGUILayout.FloatField("Fire rate (Speed) by :", fireRateProperty);
                 if (bulletPrefabProperty != null)
                     EditorGUILayout.ObjectField(bulletPrefabProperty);
 
                 break;
             // projectile Laser
             case ProjectileType.Laser:
                 // tower using laser
                 EditorGUILayout.LabelField("[Projectile : Laser]");
                 EditorGUILayout.LabelField("Damage Over Time by: ");
                 EditorGUILayout.IntField(" ", damageOverTimeProperty); 
                 EditorGUILayout.FloatField("Slow down by: ", slowPercentProperty);
                 if (lineRendererProperty != null)
                     EditorGUILayout.ObjectField(lineRendererProperty);
                 if (laserBeamImapctEffectProperty != null)
                     EditorGUILayout.ObjectField(laserBeamImapctEffectProperty);
                 if (laserBeamImpactLightProperty != null)
                     EditorGUILayout.ObjectField(laserBeamImpactLightProperty);
                 if (buffElementsMoveSlowProperty != null)
                     EditorGUILayout.ObjectField(buffElementsMoveSlowProperty);  
                 break;
         }
         EditorGUILayout.TextField("Target tag string", enemyTagProperty);
         EditorGUILayout.ObjectField(partToRotateProperty);
         EditorGUILayout.ObjectField(firePointProperty);
         EditorGUILayout.FloatField("Turn speed by: ", turnSpeedProperty);
 
         serializedObject.ApplyModifiedProperties();
         
     }
 }