View difference between Paste ID: UipmTQKg and Y1R7eSA0

 using UnityEngine;
 using UnityEditor;
 
 [CustomPropertyDrawer(typeof(Sprite))]
 public class SpritePropertyDrawer : PropertyDrawer
 {
     public override float GetPropertyHeight(SerializedProperty property, GUIContent labelN)
     {
         if (property.objectReferenceValue != null)
         {
             return _texSize;
         }
         else
         {
             return base.GetPropertyHeight(property, labelN);
         }
     }
 
     private const float _texSize = 70;
 
 
 
     public override void OnGUI(Rect position, SerializedProperty prop, GUIContent label)
     {
         EditorGUI.BeginProperty(position, label, prop);
 
-        if (prop.objectReferenceValue != null)
+        if (prop.objectReferenceValue != null && !prop.hasMultipleDifferentValues)
         {
             position.width = EditorGUIUtility.labelWidth;
             GUI.Label(position, prop.displayName);
 
             position.x += position.width;
             position.width = _texSize;
             position.height = _texSize;
 
             prop.objectReferenceValue = EditorGUI.ObjectField(position, prop.objectReferenceValue, typeof(Sprite), false);
         }
         else
         {
             EditorGUI.PropertyField(position, prop, true);
         }
 
         EditorGUI.EndProperty();
     }
 }