### 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


if (!mr.has("baseColorFactor")) {
					material->set_albedo(Color(1, 1, 1));
				}
				_set_texture_transform_uv1(bct, material);
			}
			if (mr.has("metallicFactor")) {
				material->set_metallic(mr["metallicFactor"]);
			} else {
				material->set_metallic(1.0);
			}
			if (mr.has("roughnessFactor")) {
				material->set_roughness(mr["roughnessFactor"]);
			} else {
				material->set_roughness(1.0);
			}
			if (mr.has("metallicRoughnessTexture")) {
				const Dictionary &bct = mr["metallicRoughnessTexture"];
				if (bct.has("index")) {
					const Ref<Texture2D> t = _get_texture(p_state, bct["index"], TEXTURE_TYPE_GENERIC);
					material->set_texture(BaseMaterial3D::TEXTURE_METALLIC, t);
					material->set_metallic_texture_channel(BaseMaterial3D::TEXTURE_CHANNEL_BLUE);
					material->set_texture(BaseMaterial3D::TEXTURE_ROUGHNESS, t);
					material->set_roughness_texture_channel(BaseMaterial3D::TEXTURE_CHANNEL_GREEN);
					if (!mr.has("metallicFactor")) {
						material->set_metallic(1);
					}
					if (!mr.has("roughnessFactor")) {
						material->set_roughness(1);
					}
				}