Sprite changes only briefly?

I have a script that changes some SpriteRenderers' sprites on LateUpdate(), specifically after an animation stops. I'm doing so via:

 gameObject.GetComponent<SpriteRenderer>().sprite = Resources.Load("pinkSquare", typeof(Sprite)) as Sprite;

When the code fires, I see the sprite change to a pink square, but only for an instant (maybe a frame?), then the gameobject immediately goes back to its original sprite. I searched through the entirety of my project for any other code blocks that use Update(), LateUpdate(), FixedUpdate(), and there's nothing else.

What might I be missing? I've been looking at this for hours.

Thanks!