Making a material unique with emission enabled will result in incorrect editor colors

[stryker313]

Godot version

4.0 Alpha 7

System information

Windows 10 Nvidia GTX 1060 Intel i5 4690k

Issue description

If you make a unique material on a material with emission enabled, it will glitch out in the editor

Untitled3.mp4

When making a copy of the material, pasting to another object, then making unique, the red will turn to white.

In the game, it is fine.

However, the colors are inaccurate in the editor

When you exit the editor and return, the colors will be fine again.

The editor issue only exists when you make a copy of a material, then make that material unique.

Steps to reproduce

Create 2 meshes
Create a material3d on 1 mesh
Set emission to true
Set albedo and emission color to color other than white
Copy material from mesh 1 to mesh 2
Make material on mesh 2 unique
Editor will glitch the colors out

Again, this does not affect the game. The colors are correct in game. However, the editor is inaccurate.

Minimal reproduction project

MaterialBug (2).zip

[codespren]

Bug happens here too but not only in the editor but in game also when making material unique from the code. macOS, AMD Radeon Pro 5500M, Godot 4 Beta 1.

Code:

scene = (PackedScene)ResourceLoader.Load("res://data/scenes/scene.tscn");
meshInstance = (MeshInstance3D)scene.Instantiate();
SphereMesh mesh = (SphereMesh)meshInstance.Mesh.Duplicate();
meshInstance.Mesh = mesh;
StandardMaterial3D material = (StandardMaterial3D)mesh.SurfaceGetMaterial(0).Duplicate(); // X
mesh.SurfaceSetMaterial(0, material);
AddChild(meshInstance);
StandardMaterial3D material = (StandardMaterial3D)meshInstance.Mesh.SurfaceGetMaterial(0);
material.EmissionEnabled = true;

After that the emission is very bright, basically white. If I remove Duplicate() from the line marked with X it works correctly.

[BlueMoonJune]

anyone found a work around for the runtime example?