SyncList not initialized on server when created as localPlayerAuthority on client

I'm having a lot of trouble with SyncLists. I have a script on my player prefab that is being spawned by the default NetworkManager with localPlayerAuthority that needs to have a list of ints that are synced between clients.

Currently when I start a host and then connect as a client, the two player's SyncList's will be properly initialized on the client but on the server only the host's SyncList is initialized.

When I run the below code the console on the server reads:

NetID 3's sync list on editor contains 5 things
NetID 4's sync list on editor contains 0 things

While on the client it reads:

NetID 3's sync list on standalone contains 5 things
SyncList not initialized
SyncList not initialized
SyncList not initialized
SyncList not initialized
SyncList not initialized
NetID 4's sync list on standalone contains 5 things

Here is my code:

 public class PlayingField : NetworkBehaviour
 {
     public SyncListInt monsterSyncList = new SyncListInt();
     public GameObject tempMonsterCard;
 
     void Awake()
     {
         monsterSyncList.Callback = OnMonsterChanged;
     }
 
     void Start()
     {
         if (hasAuthority)
         {
             Debug.Log("Is local player");
 
             for (int i = 0; i < 5; i++)
             {
                 monsterSyncList.Add(-1);
             }
         }
 
         Debug.LogError("NetID " + netId + "'s sync list on " + (Application.isEditor ? "editor " : "standalone ") + "contains " + monsterSyncList.Count + " things");
     }
 
     public bool setMonsterCardByIndex(GameObject card, int i)
     {
         if (hasAuthority)
         {
             monsterSyncList[i] = card.GetComponent<ICard>().cardID;
             return true;
         }
 
         return false;
     }
 
     private void OnMonsterChanged(SyncListInt.Operation op, int index)
     {
         if (SyncListInt.Operation.OP_SET == op && !hasAuthority)
         {
             if (monsterSyncList[index] != -1)
             {
                 Debug.Log("Synced");
             }
         }
     }
 }

Any help would be appreciated. I've been working at this for hours with no end in sight.