After build, UI elements are positioned differently

I have some code where I set the position of a UI element dynamically. For example:

 public static class UiPositioningStaticUtils
 {
     public static void PositionUiCanvasElementToWorldPosition(
         RectTransform uiElement,
         Vector3 worldPosition
     )
     {
         Vector2 screenPoint = Camera.main.WorldToScreenPoint(worldPosition);
 
         var canvas = uiElement.GetComponentInParent<Canvas>();
 
         Vector2 uiElementScreenPosition;
         RectTransformUtility.ScreenPointToLocalPointInRectangle(
             canvas.transform as RectTransform,
             screenPoint,
             canvas.worldCamera,
             out uiElementScreenPosition
         );
 
         uiElement.transform.position = canvas.transform.TransformPoint(uiElementScreenPosition);
     }
 }

It works perfectly but for some reason, once I build my game, the positioning is incorrect. Even simple positioning of one UI element onto another (uiElement1.transform.position = uiElement2.transform.position) is not calculated correctly anymore. I'm even using a Canvas Scaler with "Scale with Screen" mode like in other answers, w$$anonymous$$ch works fine to keep all positioned elements in place but it does not work for dynamic positioning. Anyone know what could be the cause of t$$anonymous$$s?