Unity shader missing problem

Unity There are several cases of shader loss ！

The first one is ：

Unity When building a package, it will eliminate unused by default Shader, Will not put useless Shader Package together , If you want to Unity Keep this Shader Not eliminated , take Shader Set to GraphicsSetting-> always included shader in
If there are too many customizations Shader It is impossible to set it manually , Here are the code settings

[MenuItem("Test/ Test settings included shader", false, 11)]
 public static void TestIncludedShader()
 {
    
     string[] myShaders = new string[1]{
    
         "Legacy Shaders/Diffuse"
     };
 
     SerializedObject graphicsSettings = new SerializedObject (AssetDatabase.LoadAllAssetsAtPath ("ProjectSettings/GraphicsSettings.asset") [0]);
     SerializedProperty it = graphicsSettings.GetIterator ();
     SerializedProperty dataPoint;
     while (it.NextVisible(true)) {
    
         if (it.name == "m_AlwaysIncludedShaders") {
    
             it.ClearArray();
 
             for (int i = 0; i < myShaders.Length; i++) {
     
                 it.InsertArrayElementAtIndex(i);
                 dataPoint = it.GetArrayElementAtIndex (i);
                 dataPoint.objectReferenceValue = Shader.Find(myShaders[i]);
             }
 
             graphicsSettings.ApplyModifiedProperties ();
         }
     }
 }

The second kind

Loss of hot change package Shader
hold Shader Pack into a hot bag , Under the Android editor , load Shader And shader run show pink （ Looking at the material, you can find that it is not missing materials and shader）
But it's normal on the mobile phone .
Why is that ？ This is because it is packaged when Android is used as the platform shader It is compiled into the version of Android platform , stay unity Exceptions will occur when running in the editor .

The editor is pc Platform time , The typed package works normally in the editor .

This should be Unity A question of

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