Boolean uniform instances does not assigned properly

[Chaosus]

Godot version

b2ae6f8

System information

Windows 10, GTX 1060

Issue description

Currently, all boolean types (bool, bvec2, bvec3, bvec4) in form of instance uniform seems doesn't assigned before passed to the shader:

Steps to reproduce

Create a shader like that, assign it to shader material & mesh, and try to change it through inspector or via code:

shader_type spatial;

instance uniform bool test;

void fragment() {
	ALBEDO = vec3(1, 0, 0);
	if(test) {
		ALBEDO = vec3(0, 1, 0);
	}
}

All other types should work fine - so changing it to the int type would work. I have no idea why this happening - it assigns values to the uniform buffer correctly at least at the _fill_std140_variant_ubo_value function.

Minimal reproduction project

InstanceBooleanBug.zip

[nevarek]

This line returns false, and indicates the ClassDB doesn't contain the property. This is causing the bug, because the editor has no idea what property to update in memory. It tries to search for shader_params/test and doesn't find it in the property map.

Is this kind of lookup the intended behavior or is this just a new edge case? Are unique classes added to ClassDB for dynamic properties like this?