Bevy version

main

What you did

Run the minimal 3d_scene example.

What went wrong

Very visible color banding:

Additional information

This is a known limitation of rendering to 8 bit color channels. A common solution appears to be a debanding shader. See here for a related section in the Godot docs. While this isn't a bug in the sense that the output is wrong, it's a bug in that it is a well known visible artifact that we can mitigate.