Undo.Record: Recording variables within array elements

I created an custom editor button that takes an TextField and creates a new Element in an array.

The array elements are the following class:

 [System.Serializable]
 public class NPCDialogueSettings {
     public string name; 
     public int order; 
 
     [Header("Flags")]
     public FlagNode[] flagsToCheck; //If these conditions are met the dialogue can be executed
     public FlagNode[] flagsToSet; //After dialogue these flags are set true or false
     [Header ("Execution Conditions")]
     public bool playOnce = false; 
 }

I can easily create a new element in the array and save it using Undo.RecordObject. But changing a variable in one of the elements is not saved.

Is there a way to save variables in array elements (Which is a class) using Undo.RecordObject or some other method?

More complete code of the actual function: (Note that I am trying to save: Name and Order)

  //==================Create new DialogueSettings in NPC Dialogue Controller==================
         NPCDialogueSettings[] dialogueSettingsArray = dialogueControllerRef.dialogueSettings;
         NPCDialogueSettings[] tempDialogueSettingsArray = new NPCDialogueSettings[dialogueSettingsArray.Length + 1];
 
         for (int i = 0; i < dialogueSettingsArray.Length; i++) {
                 tempDialogueSettingsArray[i] = dialogueSettingsArray[i];
                 tempDialogueSettingsArray[i].order = i;
         }
 
         int lastElement = tempDialogueSettingsArray.Length -1;
 
         //Create new NPCDialogue on last element
         tempDialogueSettingsArray[lastElement] = new NPCDialogueSettings();
 
         //Set the vars in new dialogue
         tempDialogueSettingsArray[lastElement].name = newDialogueName;
         tempDialogueSettingsArray[lastElement].order = dialogueSettingsArray.Length;
 
 
         //Record
         Undo.RecordObject(dialogueControllerRef, "Record NPC Dialogue Controller");
         //Set the new array
         dialogueControllerRef.dialogueSettings = tempDialogueSettingsArray;