### 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
glDeleteVertexArrays(1, &data.canvas_quad_array);
	glDeleteBuffers(1, &data.canvas_quad_vertices);
	glDeleteVertexArrays(1, &data.canvas_quad_array);
	GLES3::TextureStorage::get_singleton()->canvas_texture_free(default_canvas_texture);
	memdelete_arr(state.instance_data_array);
	memdelete_arr(state.light_uniforms);
	if (state.shadow_fb != 0) {
		glDeleteFramebuffers(1, &state.shadow_fb);
		GLES3::Utilities::get_singleton()->texture_free_data(state.shadow_texture);
		glDeleteRenderbuffers(1, &state.shadow_depth_buffer);
		state.shadow_fb = 0;
		state.shadow_texture = 0;
		state.shadow_depth_buffer = 0;
	}
	for (uint32_t i = 0; i < state.canvas_instance_data_buffers.size(); i++) {
		for (int j = 0; j < state.canvas_instance_data_buffers[i].instance_buffers.size(); j++) {
			if (state.canvas_instance_data_buffers[i].instance_buffers[j]) {
				GLES3::Utilities::get_singleton()->buffer_free_data(state.canvas_instance_data_buffers[i].instance_buffers[j]);
			}
		}
		if (state.canvas_instance_data_buffers[i].light_ubo) {
			GLES3::Utilities::get_singleton()->buffer_free_data(state.canvas_instance_data_buffers[i].light_ubo);
		}
		if (state.canvas_instance_data_buffers[i].state_ubo) {
			GLES3::Utilities::get_singleton()->buffer_free_data(state.canvas_instance_data_buffers[i].state_ubo);
		}
	}
}
#endif