Resolved Rigidbodies passing through tilemap collider

EDIT: I found my trivial mistake, it was just making the sheep's Rigidbody2D dynamic instead of kinematic

Hi all, this is my first post here, so sorry in advance if I mess things up.

As the title suggests, I'm having trouble with my objects (in this case, sheep) passing through my tilemap colliders (fences). I recorded what happens here:

As seen in the video, the player and a test object, "Mr Peanut", collides with the fences, but the sheep goes right through.
I am using rigidbody2d.MovePosition in all three cases.
I suspect the issue comes from the script that moves the sheep. The script is added to the preyMovement object, and can be seen here:

Code (CSharp):

1.     public float longRangeAttraction;
2.     public float predatorRepulsion;
3.     private GameObject playerObj = null;
4.     private void Start()
5.     {
6.      
7.         if (playerObj == null)
8.         {
9.             playerObj = GameObject.FindGameObjectWithTag("Player");
10.         }
11.     }
12.  
13.  
14.     private void FixedUpdate()
15.     {
16.         /* Movement
17.         Loop through each member and calculate their velocity, and from that update their position.
18.         Calculation requires looping through all members again, excluding the initial. */
19.  
20.         // Find all current prey and add them to the list preyList
21.         List<GameObject> preyList = new();
22.         foreach (GameObject fooObj in GameObject.FindGameObjectsWithTag("Prey"))  //Maybe find a way to only run this code if an object is removed
23.         {
24.             preyList.Add(fooObj);
25.         }
26.         // Loop through each prey in preyList and update its position by calculating its velocity
27.         foreach (GameObject prey in preyList)
28.         {
29.             Vector2 velocity = Move_prey(preyList, prey);
30.  
31.             // Align sprite direction with velocity
32.             SpriteRenderer spriteRenderer = prey.GetComponent<SpriteRenderer>();
33.             if (velocity.x < 0)
34.             {
35.                 spriteRenderer.flipX = true;
36.             }
37.             else if (velocity.x > 0)
38.             {
39.                 spriteRenderer.flipX = false;
40.             }
41.  
42.             // Movement
43.             Rigidbody2D preyRB = prey.GetComponent<Rigidbody2D>(); // Get j'th particle's rigidbody and update its position
44.             preyRB.MovePosition(preyRB.position + (velocity * Time.fixedDeltaTime));
45.  
46.         }
47.  
48.     }
49.     // The mathematical function that calculates the velocity for a prey
50.     private Vector2 Move_prey(List<GameObject> preyList, GameObject prey)
51.     {       int numberOfPrey = preyList.Count;
52.             Vector2 velocity = new Vector2(0, 0); // Velocity of j'th particle, will be updated
53.             foreach (GameObject otherPrey in preyList) // The k'th particle
54.             {
55.                 if (otherPrey == prey)
56.                 {
57.                     continue;
58.                 }
59.  
60.                 float dist = Vector2.Distance(prey.transform.position, otherPrey.transform.position);
61.                 Vector2 velocityShortRange = (prey.transform.position - otherPrey.transform.position) / (dist * dist);
62.                 Vector2 velocityLongRange = longRangeAttraction * (prey.transform.position - otherPrey.transform.position);
63.  
64.                 velocity += (velocityShortRange - velocityLongRange) / numberOfPrey;
65.  
66.             }
67.             float dist_pred = Vector2.Distance(prey.transform.position, playerObj.transform.position);
68.             Vector2 velocityPredRepulsion = predatorRepulsion * (prey.transform.position - playerObj.transform.position) / (dist_pred * dist_pred);
69.             velocity += velocityPredRepulsion;
70.         return velocity;
71.     }

The "Mr. Peanut" object's movement is simply:

Code (CSharp):

1.        Vector2 velocity = new Vector2(1, 0);
2.         rb.MovePosition(rb.position + velocity * Time.fixedDeltaTime);

And the player's movement is similar, just with inputs instead.

I also tried using physics.Raycast to check if there was an obstacle in front of the sheep, but it never detected any.

I hope my post meets the community standards.
Thanks in advance.

 

I feel like an absoule idiot, I used like 5 hours on this, just to find out it was literally just making the Rigidbody2D on the sheep "Dynamic" instead of "Kinematic".

Well, lesson learned I guess