Godot version

4.0b13

System information

macOS 13.0.1

Issue description

The shadow opacity parameter on DirectionalLight3d does not seem to work as intended on the Mobile renderer. Using the Forward+ renderer it works as expected, but on the Mobile renderer it has no effect unless set to 0 where the shadow disappears completely.

Steps to reproduce

• Set your project to use the Mobile Renderer
• Set up a scene with some meshes and a default directionalLight3D to cast shadows
• Enable shadows on the light and change the Shadow Opacity parameter

Minimal reproduction project

shadow_opacity_test.zip