### 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


} else if (p_skin->non_joints.find(parent) < 0) {
					p_skin->non_joints.push_back(parent);
				}
				roots.write[i] = parent;
			}
		}
	} while (!all_same);
}
Error GLTFDocument::_expand_skin(Ref<GLTFState> p_state, Ref<GLTFSkin> p_skin) {
	_capture_nodes_for_multirooted_skin(p_state, p_skin);
	
	DisjointSet<GLTFNodeIndex> disjoint_set;
	Vector<GLTFNodeIndex> all_skin_nodes;
	all_skin_nodes.append_array(p_skin->joints);
	all_skin_nodes.append_array(p_skin->non_joints);
	for (int i = 0; i < all_skin_nodes.size(); ++i) {
		const GLTFNodeIndex node_index = all_skin_nodes[i];
		const GLTFNodeIndex parent = p_state->nodes[node_index]->parent;
		disjoint_set.insert(node_index);
		if (all_skin_nodes.find(parent) >= 0) {
			disjoint_set.create_union(parent, node_index);
		}
	}
	Vector<GLTFNodeIndex> out_owners;
	disjoint_set.get_representatives(out_owners);
	Vector<GLTFNodeIndex> out_roots;
	for (int i = 0; i < out_owners.size(); ++i) {
		Vector<GLTFNodeIndex> set;
		disjoint_set.get_members(set, out_owners[i]);
		const GLTFNodeIndex root = _find_highest_node(p_state, set);