### Godot version

4.1.1.stable, 4.2.dev (2282fc5de)

### System information

Arch Linux - X11 - GLES3 (Compatibility) - NVIDIA GeForce RTX 3060 Ti (nvidia; 535.104.05) - 13th Gen Intel(R) Core(TM) i5-13400F (16 Threads)

### Issue description

When using Compatibility renderer, adjusting the Alpha component of clear color affects 2D editor content.

This does not happen when using Forward+ or Mobile renderer. Does not affect 3D editor and the running game.


https://github.com/godotengine/godot/assets/372476/e398522e-590a-4832-959f-ea8ba8e71c5d



### Steps to reproduce

1. Create a project using Compatibility renderer.
2. Adjust the clear color's alpha component in Project Settings.

### Minimal reproduction project

N/A
lights[light_count >> 2] |= light_index << ((light_count & 3) * 8);
				light_count++;
				if (light_count == data.max_lights_per_item - 1) {
					break;
				}
			}
			light = light->next_ptr;
		}
		base_flags |= light_count << FLAGS_LIGHT_COUNT_SHIFT;
	}
	bool lights_disabled = light_count == 0 && !state.using_directional_lights;
	if (lights_disabled != state.canvas_instance_batches[state.current_batch_index].lights_disabled) {
		_new_batch(r_batch_broken);
		state.canvas_instance_batches[state.current_batch_index].lights_disabled = lights_disabled;
	}
	const Item::Command *c = p_item->commands;
	while (c) {
		if (skipping && c->type != Item::Command::TYPE_ANIMATION_SLICE) {
			c = c->next;
			continue;
		}
		if (c->type != Item::Command::TYPE_MESH) {
			
			_update_transform_2d_to_mat2x3(base_transform * draw_transform, state.instance_data_array[r_index].world);
		}
		
		for (int i = 0; i < 4; i++) {
			state.instance_data_array[r_index].modulation[i] = 0.0;
			state.instance_data_array[r_index].ninepatch_margins[i] = 0.0;
			state.instance_data_array[r_index].src_rect[i] = 0.0;