### 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


const Array &samplers = p_state->json["samplers"];
	for (int i = 0; i < samplers.size(); ++i) {
		const Dictionary &d = samplers[i];
		Ref<GLTFTextureSampler> sampler;
		sampler.instantiate();
		if (d.has("minFilter")) {
			sampler->set_min_filter(d["minFilter"]);
		} else {
			sampler->set_min_filter(GLTFTextureSampler::FilterMode::LINEAR_MIPMAP_LINEAR);
		}
		if (d.has("magFilter")) {
			sampler->set_mag_filter(d["magFilter"]);
		} else {
			sampler->set_mag_filter(GLTFTextureSampler::FilterMode::LINEAR);
		}
		if (d.has("wrapS")) {
			sampler->set_wrap_s(d["wrapS"]);
		} else {
			sampler->set_wrap_s(GLTFTextureSampler::WrapMode::DEFAULT);
		}
		if (d.has("wrapT")) {
			sampler->set_wrap_t(d["wrapT"]);
		} else {
			sampler->set_wrap_t(GLTFTextureSampler::WrapMode::DEFAULT);
		}
		p_state->texture_samplers.push_back(sampler);
	}
	return OK;
}
Error GLTFDocument::_serialize_materials(Ref<GLTFState> p_state) {