Enemy CharacterController stopped detecting all triggers, but Player's CharacterController still detects and fires the same triggers

I have a Player prefab with a Character Controller component that when it overlaps the trigger for a pressure plate, the OnTriggerEnter method is called. However, I also have a Sheep prefab with a Character Controller component that does not call the OnTriggerEnter method though it did yesterday (despite not changing any properties for this pressure plate or Sheep's triggers script).

I'm at a total loss as I have tried everything from ensuring the method declaration is spelled correctly private void OnTriggerEnter(Collider other) to making sure the "isTrigger" box is ticked for the BoxCollider on the pressure plate. I also tried adding a RigidBody that is kinematic to the Sheep prefab and then to the Pressure Plate prefab but to no avail. Any help would be greatly appreciated.

Sheep Prefab:

The Sheep prefab has just a CharacterController with the exact same property settings as the Player prefab other than the height. As I understand it, the CharacterController component has a RigidBody so I don't need to add one for the collision system to work (as I have done with the Player).

Pressure Plate Prefab:

Each Cube on the Pressure Plate including the base has a BoxCollider with "isTrigger" unticked. Only the Trigger child GameObject has a BoxCollider with "isTrigger" ticked.

PlayerTriggers.cs (attached to Player)

 public class PlayerTriggers : MonoBehaviour
 {
     PlayerMovement movement;
 
 
     private void Awake()
     {
         movement = GetComponent<PlayerMovement>();
     }
 
 
     private void Start()
     {
         Physics.IgnoreLayerCollision(gameObject.layer, Layers.SHEEP);
     }
 
 
     private void OnTriggerEnter(Collider other)
     {
         print("PLAYER ON TRIGGER ENTER------------------------");
 
         if (other.CompareTag(Tags.SPRING))
         {
             movement.Spring(other.GetComponent<Spring>().GetForce());
         }
     }
 }

SheepTriggers.cs (attached to Sheep):

 public class SheepTriggers : MonoBehaviour
 {
     private SheepMovement movement;
 
 
     private void Awake()
     {
         movement = GetComponent<SheepMovement>();
     }
 
 
     void OnTriggerEnter(Collider other)
     {
         print("TRIGGER---------------------------");
 
         if (other.CompareTag(Tags.SPRING))
         {
             movement.Spring(other.GetComponent<Spring>().GetForce());
         }
 
         if (other.CompareTag(Tags.PRESSURE_PLATE))
         {
             movement.SetIdle(true);
             
         }
 
         if (other.CompareTag(Tags.CONVEYOR_BELT))
         {
             movement.AddVelocity(other.GetComponent<ConveyorBelt>().GetVelocity());
         }
     }
 }

When the Player moves onto the Pressure Plate, the debug console prints PLAYER ON TRIGGER ENTER------------------------, but for the Sheep it prints nothing. Any ideas? Is there something I'm missing here? Thanks so much!