Question Shadergui material SetDirty doesnt work

Hello, i am trying to make a toggle for custom shadergui. After changing the material keyword, even if SetDirty is called, the keyword reverts to its old value after saving the scene with Ctrl+S. I tried to do it similar to the documentation, but I couldn't find the source of the problem. Where do you think the problem might be?

Reference doc : https://docs.unity.cn/ScriptReference/ShaderGUI.html

Code (CSharp):

1.  
2.                     bool toggle = _keywords.Contains(currentFoldoutName);
3.                     EditorGUI.BeginChangeCheck();
4.                     toggle = EditorGUILayout.BeginToggleGroup(propertyData.OnlyName, toggle);
5.                     isInsideFoldout = true;
6.                     if (EditorGUI.EndChangeCheck())
7.                     {
8.                         if (toggle)
9.                         {
10.                             _material.EnableKeyword(currentFoldoutName);
11.                         }
12.                         else
13.                         {
14.                             _material.DisableKeyword(currentFoldoutName);
15.  
16.                         }
17.                         if (!Application.isPlaying) EditorSceneManager.MarkSceneDirty(EditorSceneManager.GetActiveScene());
18.                         EditorUtility.SetDirty(_material);
19.                     }

 

When i use float instead of boolean keyword, it works well.