Cannot create new Shader on ShaderMaterial

[layton7362]

Godot version

4.2.beta.3.mono.official

System information

Windows 11

Issue description

Steps to reproduce

Just create an Object and give it a ShaderMaterial. Try to create a Shader. The Button is not clickable

But its still possible to convert a StandardMaterial to ShaderMaterial

Minimal reproduction project

N/A

[KoBeWi]

Seems to happen in newly created unsaved scenes. The path to shader is invalid. Try saving the scene.