### 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)

state.canvas_instance_batches[state.current_batch_index].shader_variant = CanvasShaderGLES3::MODE_PRIMITIVE;
				}
				_prepare_canvas_texture(state.canvas_instance_batches[state.current_batch_index].tex, state.canvas_instance_batches[state.current_batch_index].filter, state.canvas_instance_batches[state.current_batch_index].repeat, r_index, texpixel_size);
				for (uint32_t j = 0; j < MIN(3u, primitive->point_count); j++) {
					state.instance_data_array[r_index].points[j * 2 + 0] = primitive->points[j].x;
					state.instance_data_array[r_index].points[j * 2 + 1] = primitive->points[j].y;
					state.instance_data_array[r_index].uvs[j * 2 + 0] = primitive->uvs[j].x;
					state.instance_data_array[r_index].uvs[j * 2 + 1] = primitive->uvs[j].y;
					Color col = primitive->colors[j] * base_color;
					state.instance_data_array[r_index].colors[j * 2 + 0] = (uint32_t(Math::make_half_float(col.g)) << 16) | Math::make_half_float(col.r);
					state.instance_data_array[r_index].colors[j * 2 + 1] = (uint32_t(Math::make_half_float(col.a)) << 16) | Math::make_half_float(col.b);
				}
				_add_to_batch(r_index, r_batch_broken);
				if (primitive->point_count == 4) {
					
					_update_transform_2d_to_mat2x3(base_transform * draw_transform, state.instance_data_array[r_index].world);
					_prepare_canvas_texture(state.canvas_instance_batches[state.current_batch_index].tex, state.canvas_instance_batches[state.current_batch_index].filter, state.canvas_instance_batches[state.current_batch_index].repeat, r_index, texpixel_size);
					for (uint32_t j = 0; j < 3; j++) {
						int offset = j == 0 ? 0 : 1;
						
						state.instance_data_array[r_index].points[j * 2 + 0] = primitive->points[j + offset].x;
						state.instance_data_array[r_index].points[j * 2 + 1] = primitive->points[j + offset].y;
						state.instance_data_array[r_index].uvs[j * 2 + 0] = primitive->uvs[j + offset].x;
						state.instance_data_array[r_index].uvs[j * 2 + 1] = primitive->uvs[j + offset].y;
						Color col = primitive->colors[j + offset] * base_color;
						state.instance_data_array[r_index].colors[j * 2 + 0] = (uint32_t(Math::make_half_float(col.g)) << 16) | Math::make_half_float(col.r);
						state.instance_data_array[r_index].colors[j * 2 + 1] = (uint32_t(Math::make_half_float(col.a)) << 16) | Math::make_half_float(col.b);
					}
					_add_to_batch(r_index, r_batch_broken);
				}