### Godot version

4.0.2 stable

### System information

issue tested on win10 with ryzen 7 and rx 6600, win11 with ryzen 7 and gtx 3050

### Issue description

When creating a screen reading post processing shader, the normal buffer functions correctly in the editor, but does not seem to be functioning as expected in debug, producing only a solid colour when run. I am unsure if this behaviour is intended, but if so, I feel it should be properly documented.

Running correctly in editor:
![image](https://user-images.githubusercontent.com/71034402/230672620-fc5e4baf-c12e-4755-b7a2-206087459307.png)

Solid colour in debug:
![image](https://user-images.githubusercontent.com/71034402/230672489-d9c29755-c2d3-4e72-9ea0-355148e916fe.png)


### Steps to reproduce

*this shader should be attached to a MeshInstance3D quadmesh*
minimal shader to reproduce:

```glsl
shader_type spatial;
render_mode unshaded, cull_disabled;

uniform sampler2D NORMAL_TEXTURE : hint_normal_roughness_texture, filter_linear_mipmap;

void vertex(){
	VERTEX *= 2.0;
	POSITION = vec4(VERTEX, 1.0);
}

void fragment(){
	ALBEDO = texture(NORMAL_TEXTURE, SCREEN_UV).rgb;
}
```

### Minimal reproduction project

N/A
ERR_FAIL_NULL(ss_effects);
	ERR_FAIL_COND(p_render_buffers.is_null());
	ERR_FAIL_COND(p_environment.is_null());
	Ref<RenderBufferDataForwardClustered> rb_data = p_render_buffers->get_custom_data(RB_SCOPE_FORWARD_CLUSTERED);
	ERR_FAIL_COND(rb_data.is_null());
	RENDER_TIMESTAMP("Process SSIL");
	RendererRD::SSEffects::SSILSettings settings;
	settings.radius = environment_get_ssil_radius(p_environment);
	settings.intensity = environment_get_ssil_intensity(p_environment);
	settings.sharpness = environment_get_ssil_sharpness(p_environment);
	settings.normal_rejection = environment_get_ssil_normal_rejection(p_environment);
	settings.full_screen_size = p_render_buffers->get_internal_size();
	ss_effects->ssil_allocate_buffers(p_render_buffers, rb_data->ss_effects_data.ssil, settings);
	Transform3D transform = p_transform;
	transform.set_origin(Vector3(0.0, 0.0, 0.0));
	for (uint32_t v = 0; v < p_render_buffers->get_view_count(); v++) {
		Projection correction;
		correction.set_depth_correction(true);
		Projection projection = correction * p_projections[v];
		Projection last_frame_projection = rb_data->ss_effects_data.last_frame_projections[v] * Projection(rb_data->ss_effects_data.last_frame_transform.affine_inverse()) * Projection(transform) * projection.inverse();
		ss_effects->screen_space_indirect_lighting(p_render_buffers, rb_data->ss_effects_data.ssil, v, p_normal_buffers[v], p_projections[v], last_frame_projection, settings);
		rb_data->ss_effects_data.last_frame_projections[v] = projection;
	}
	rb_data->ss_effects_data.last_frame_transform = transform;
}
void RenderForwardClustered::_copy_framebuffer_to_ssil(Ref<RenderSceneBuffersRD> p_render_buffers) {