SCREEN_TEXTURE is blank when Use Physical Light Units is enabled

[Arnklit]

Godot version

4.0.beta8

System information

Windows 10, GTX 980 Ti, Vulkan Forward+

Issue description

Before enabling Physical Light Units:

After enabling Physical Light Units:

Steps to reproduce

Create a mesh and assign a Standard Material to it and set transparency to alpha, set Albedo's alpha to 0 and enable refraction.
Then enable Use Physical Light Units in the project settings.

Minimal reproduction project

refraction_real_light_units_bug.zip

[atirut-w]

Still happening on alpha 10

[Calinou]

This is likely because the screen texture is being generated, but it's way too dark as a result of not accounting for physical light units. Try using RenderDoc to check for this.