RectTransformUtility.ScreenPointToLocalPointInRectangle does not work correctly?

RectTransformUtility.ScreenPointToLocalPointInRectangle (RectTransform, Input.mousePosition, Camera.main, out Vector2); returns a different value with a different tag for a single Game Object with a Camera component on the scene, namely, with the MainCamera tag, it returns correct coordinates, but with the Untagged tag, it returns incorrect coordinates.