### 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
state.current_instance_buffer_index++;
	if (int(state.current_instance_buffer_index) < state.canvas_instance_data_buffers[state.current_data_buffer_index].instance_buffers.size()) {
		
		return;
	}
	GLuint new_buffer;
	glGenBuffers(1, &new_buffer);
	glBindBuffer(GL_ARRAY_BUFFER, new_buffer);
	GLES3::Utilities::get_singleton()->buffer_allocate_data(GL_ARRAY_BUFFER, new_buffer, data.max_instance_buffer_size, nullptr, GL_STREAM_DRAW, "Batch UBO[" + itos(state.current_data_buffer_index) + "][" + itos(state.canvas_instance_data_buffers[state.current_data_buffer_index].instance_buffers.size()) + "]");
	state.canvas_instance_data_buffers[state.current_data_buffer_index].instance_buffers.push_back(new_buffer);
	glBindBuffer(GL_ARRAY_BUFFER, 0);
}
void RasterizerCanvasGLES3::set_time(double p_time) {