### 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->json.has("extensions")) {
		return OK;
	}
	Dictionary extensions = p_state->json["extensions"];
	if (!extensions.has("KHR_lights_punctual")) {
		return OK;
	}
	Dictionary lights_punctual = extensions["KHR_lights_punctual"];
	if (!lights_punctual.has("lights")) {
		return OK;
	}
	const Array &lights = lights_punctual["lights"];
	for (GLTFLightIndex light_i = 0; light_i < lights.size(); light_i++) {
		Ref<GLTFLight> light = GLTFLight::from_dictionary(lights[light_i]);
		if (light.is_null()) {
			return Error::ERR_PARSE_ERROR;
		}
		p_state->lights.push_back(light);
	}
	print_verbose("glTF: Total lights: " + itos(p_state->lights.size()));
	return OK;
}
Error GLTFDocument::_parse_cameras(Ref<GLTFState> p_state) {