[BP] Paper2D TileMaps disappear's when packaging.

Hi ! I have a Tilemap with the “DefaultLitSpriteMaterial” applied to it. So it can receive light from light sources. Everything works fine when i play in the editor. A soon as i package the game or start it as a standalone, the tilemap disappears. The Collision is there but i cant see the Tilemap. When i apply the Unlit Sprite Material to the Tilemap i dont encounter this error.