### 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


Dictionary texture_transform;
	bool is_offset = p_offset != Vector2(0.0, 0.0);
	if (is_offset) {
		Array offset;
		offset.resize(2);
		offset[0] = p_offset.x;
		offset[1] = p_offset.y;
		texture_transform["offset"] = offset;
	}
	bool is_scaled = p_scale != Vector2(1.0, 1.0);
	if (is_scaled) {
		Array scale;
		scale.resize(2);
		scale[0] = p_scale.x;
		scale[1] = p_scale.y;
		texture_transform["scale"] = scale;
	}
	Dictionary extension;
	
	if (is_offset || is_scaled) {
		extension["KHR_texture_transform"] = texture_transform;
	}
	return extension;
}
Dictionary GLTFDocument::_serialize_texture_transform_uv1(Ref<BaseMaterial3D> p_material) {