I am using URP. I have three cameras - main, overlay UI, worldspace UI. When I put the worldspace UI before the overlay UI camera in the stack list, everything renders. However, the worldspace UI renderers on top of the overlay UI. When I put the overlay camera first, however, the worldspace UI disappears.

Why can't I put the overlay camera first? I would like the overlay UI to render over the worldspace UI.

I just setup a very simple scene with camera stacking: (1) main camera (for 3D) (2) worldspace UI and (3) overlay UI. Everything is rendering as expected. The overlay is rendered on top of the world space UI.