### 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 (!p_state->textures.size()) {
		return OK;
	}
	Array textures;
	for (int32_t i = 0; i < p_state->textures.size(); i++) {
		Dictionary d;
		Ref<GLTFTexture> t = p_state->textures[i];
		ERR_CONTINUE(t->get_src_image() == -1);
		d["source"] = t->get_src_image();
		GLTFTextureSamplerIndex sampler_index = t->get_sampler();
		if (sampler_index != -1) {
			d["sampler"] = sampler_index;
		}
		textures.push_back(d);
	}
	p_state->json["textures"] = textures;
	return OK;
}
Error GLTFDocument::_parse_textures(Ref<GLTFState> p_state) {