### Godot version

0810ecaafdbee3ea747219e6ab3a8de5d2216a09

### System information

Windows 11, Nvidia 3000, firefox

### Issue description

Exporting the gltf file is corrupt in blender.

### Steps to reproduce

1. Open project.
2. Export as glb
3. Open in blender
4. Blender display many warnings

![image](https://user-images.githubusercontent.com/32321/216740742-de662c5c-f5c3-44b5-a36e-8ad33defdbba.png)


### Minimal reproduction project

https://cdn.discordapp.com/attachments/598003845657788438/1071249610896580691/Test_Game_Project.zip


p_state->use_khr_texture_transform = true;
				}
				mr["metallicRoughnessTexture"] = mrt;
			}
		}
		d["pbrMetallicRoughness"] = mr;
		if (base_material->get_feature(BaseMaterial3D::FEATURE_NORMAL_MAPPING)) {
			Dictionary nt;
			Ref<ImageTexture> tex;
			tex.instantiate();
			{
				Ref<Texture2D> normal_texture = base_material->get_texture(BaseMaterial3D::TEXTURE_NORMAL);
				if (normal_texture.is_valid()) {
					
					Ref<Image> img = normal_texture->get_image();
					if (img.is_valid()) {
						Ref<ImageTexture> img_tex = img;
						if (img_tex.is_valid()) {
							img = img_tex->get_image();
						}
						img->decompress();
						img->convert(Image::FORMAT_RGBA8);
						img->convert_ra_rgba8_to_rg();
						for (int32_t y = 0; y < img->get_height(); y++) {
							for (int32_t x = 0; x < img->get_width(); x++) {
								Color c = img->get_pixel(x, y);
								Vector2 red_green = Vector2(c.r, c.g);
								red_green = red_green * Vector2(2.0f, 2.0f) - Vector2(1.0f, 1.0f);
								float blue = 1.0f - red_green.dot(red_green);
								blue = MAX(0.0f, blue);