### Godot version

4.0 beta 17

### System information

Windows 10

### Issue description

MultiMeshInstance2D is not displaying anything in renderer `gl_compatibility` (GLES3)
Works as expected with `forward_plus` 

### Steps to reproduce

Create a project with renderer `gl_compatibility`
Add a MultiMeshInstance2D


### Minimal reproduction project


[Multimeshinstance2d.zip](https://github.com/godotengine/godot/files/10578720/Multimeshinstance2d.zip)

data.max_lights_per_render = 64;
	} else {
		data.max_lights_per_render = 256;
	}
	
	data.max_instances_per_buffer = uint32_t(GLOBAL_GET("rendering/gl_compatibility/item_buffer_size"));
	data.max_instance_buffer_size = data.max_instances_per_buffer * sizeof(InstanceData); 
	state.canvas_instance_data_buffers.resize(3);
	state.canvas_instance_batches.reserve(200);
	for (int i = 0; i < 3; i++) {
		GLuint new_buffers[3];
		glGenBuffers(3, new_buffers);
		
		glBindBuffer(GL_ARRAY_BUFFER, new_buffers[0]);
		glBufferData(GL_ARRAY_BUFFER, data.max_instance_buffer_size, nullptr, GL_STREAM_DRAW);
		
		glBindBuffer(GL_UNIFORM_BUFFER, new_buffers[1]);
		glBufferData(GL_UNIFORM_BUFFER, sizeof(LightUniform) * data.max_lights_per_render, nullptr, GL_STREAM_DRAW);
		
		glBindBuffer(GL_UNIFORM_BUFFER, new_buffers[2]);
		glBufferData(GL_UNIFORM_BUFFER, sizeof(StateBuffer), nullptr, GL_STREAM_DRAW);
		DataBuffer db;
		db.instance_buffers.push_back(new_buffers[0]);
		db.light_ubo = new_buffers[1];
		db.state_ubo = new_buffers[2];
		db.last_frame_used = 0;
		db.fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
		state.canvas_instance_data_buffers[i] = db;
	}
	glBindBuffer(GL_ARRAY_BUFFER, 0);