Generic Pooler not saving serialized fields on build?

I have a pooler component that takes in a generic type. So, if I want a pooler for SpriteRenderers, I can inherit the generic class with ObjectPooler and it will make a pooler of SpriteRenderers. Problem is, when I build it to Windows Standalone, the public field "Prefab" doesn't seem to be filled. So, it throws an error. It works completely fine in the Unity Editor, but when I build it, it seems to lose the serializing of the field and sets it to null.

Any idea what might be causing this behavior?

 using System.Collections.Generic;
 using UnityEngine;
 
 public class ObjectPooler<T> : MonoBehaviour where T : Component {
 #if UNITY_EDITOR
     [Header("Debug")]
     public bool Request = false;
     public Vector2 Position;
 
     private void Update() {
         if (!Request) return;
         Request = false;
         T prefab = Get();
         DebugSpawned(prefab);
         prefab.gameObject.SetActive(true);
     }
     protected virtual void DebugSpawned(T prefab) {
         prefab.transform.position = Position;
     }
     [Space]
 #endif
     public T Prefab;
 
     public readonly HashSet<T> CreatedPrefabs = new HashSet<T>();
 
     public T Get() {
         foreach (T item in CreatedPrefabs) {
             if (!item.gameObject.activeSelf)
                 return item;
         }
         T newPrefab = InstantiatePrefab();
         CreatedPrefabs.Add(newPrefab);
         return newPrefab;
     }
 
     protected virtual T InstantiatePrefab() {
         return Instantiate(Prefab);
     }
 
 }
 
 using UnityEngine;
 
 public abstract class TileSpritePooler<T> : ObjectPooler<T> where T : TileSprite {
     public GameManager GameManager;
     public RegenerateCompositeCollider RegenerateCompositeCollider;
     public Transform Parent;
 
     protected override T InstantiatePrefab() {
         T tileSprite = base.InstantiatePrefab();
         tileSprite.transform.SetParent(Parent);
         tileSprite.Initialize(GameManager, RegenerateCompositeCollider);
         return tileSprite;
     }
 
 }
 
 public class GroundTileSpritePooler : TileSpritePooler<GroundTileSprite> {
 
 }