Instance uniform's value is discarded when an error show up in the shader editor

[mieldepoche]

Godot version

4.0.alpha13

System information

Linux

Issue description

recording-2022-08-07_16.51.37.mp4

As you can see, instance uniforms are reset when an error is detected in the shader.
Also (you can't see that in the video): the value during the error is actually reset to 0. It just happens my custom value in the video is 0.

For some reason a [null] field showed up in the inspector (I think it appeared when I renamed uniforms for this test) but went away on scene reload and I couldn't reproduce it.

Steps to reproduce

shader_type spatial;

instance uniform float r = 1.0;

void fragment() {
	ALBEDO.r = r;
}

Minimal reproduction project

No response