### 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
glEnableVertexAttribArray(0);
		glBindVertexArray(0);
		glBindBuffer(GL_ARRAY_BUFFER, 0); 
	}
	{
		
		glGenBuffers(1, &data.particle_quad_vertices);
		glBindBuffer(GL_ARRAY_BUFFER, data.particle_quad_vertices);
		{
			
			const float qv[16] = {
				-0.5, -0.5,
				0.0, 0.0,
				-0.5, 0.5,
				0.0, 1.0,
				0.5, 0.5,
				1.0, 1.0,
				0.5, -0.5,
				1.0, 0.0
			};
			glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 16, qv, GL_STATIC_DRAW);
		}
		glBindBuffer(GL_ARRAY_BUFFER, 0); 
		glGenVertexArrays(1, &data.particle_quad_array);
		glBindVertexArray(data.particle_quad_array);
		glBindBuffer(GL_ARRAY_BUFFER, data.particle_quad_vertices);
		glEnableVertexAttribArray(RS::ARRAY_VERTEX);
		glVertexAttribPointer(RS::ARRAY_VERTEX, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, nullptr);
		glEnableVertexAttribArray(RS::ARRAY_TEX_UV);
		glVertexAttribPointer(RS::ARRAY_TEX_UV, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, CAST_INT_TO_UCHAR_PTR(8));