I want to add light2d to my project, but it's a decision I made after months I started the project, so then I added the urp package. But something strange happended: my skybox disappeared. I mean, it can't display neither in my scene view nor game view, it seems it's totally transparented instead of a material error. I have checked my lighting settings and camera settings, but there's no problem. I tried to restart Unity editor, but it can't solve the problem.
Sorry for poor English, hoping you can read this.
If you use a "URP Asset (with 2D Renderer)", it wont use the Skybox material set in Lightning -> Environment. Its probably by design i guess (2D dont need a "box", instead a rect will suffice).
Use the other Asset (with Universal Renderer) or set your "Skybox" as Sprite material in the scene.