Script not executing in Android build but working in Editor

Hi,

Issue: My game is working correctly in Unity Editor but when I build for mobile, some scripts don't run and functions aren't called.

What I've tried: I have tried changing my code multiple times, shifting logic to and from Awake and Start and trying to force script execution order. I also tried calling the CheckCompletionQuestLine() method with a delay using a coroutine and this still didn't work. The only thing it should need to run is the reference to my SaveManager (which it gets before calling the function) and those GO and component references at top (which are all assigned manually in the inspector).

Code: Here is my code example for the script that isn't working on start on Android. This code sits on a GameObject in my game scene.

 SaveManager saveManager;
 public GameObject courtyardConfines;
 public GameObject castleGardenConfines;
 public BoxCollider2D marketToCastleTransfer;
 public GameObject princessQuestBubble;
 public GameObject executionerQuestBubble;

 private void Start()
 {
     saveManager = GameObject.FindGameObjectWithTag("SaveManager").GetComponent<SaveManager>();
     CheckCompletionQuestLine();
 }

 public void CheckCompletionQuestLine()
 {
     if (saveManager.myStats.questProgress.Count == 0)
     {
         UpdateQuestBubbles(executionerQuestBubble, true);
     }
     else if (saveManager.myStats.questProgress.Contains("Quest1Complete"))
     {
        Quest1CompleteToggles();
     }
     else if (saveManager.myStats.questProgress.Contains("Quest1Part1"))
     {
         Quest1Part1Toggles();
     }
 }

 private void Quest1Part1Toggles()
 {
     courtyardConfines.SetActive(true);
     castleGardenConfines.SetActive(true);
     marketToCastleTransfer.enabled = true;
     UpdateQuestBubbles(executionerQuestBubble, false);
     UpdateQuestBubbles(princessQuestBubble, true);
 }

 private void Quest1CompleteToggles()
 {
     castleGardenConfines.SetActive(true);
     courtyardConfines.SetActive(false);
     UpdateQuestBubbles(princessQuestBubble, true);
 }

 private void UpdateQuestBubbles(GameObject charBubble, bool truefalse) => charBubble.SetActive(truefalse);

Do you have any suggestions to make this behave on my Android build as it does in Editor? Thank you for reading.