Since it is designed for a 2D Enviroment and for reach maximum performance must sacrifice some things. This limitations are:
*)Only allow rotations in Z Axis.
*)Can’t allow scale of 2DLight gameObject itself, use radius light property instead.
*)Only works in X and Y axes. Don’t allow exchange between X → Z or Y → Z (3D Top-Down game isn’t compatible with)
*) Not have a real Concave compatibility. Can’t detect Collider segment intersection. See this link.
*) Don’t allow Interpolation on rigidBody2D.
*)Don’t support PolygonCollider2D paths.