### 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


break;
					}
					time += increment;
					if (time >= anim_end) {
						last = true;
						time = anim_end;
					}
				}
			}
		}
	}
	animation->set_length(anim_end - anim_start);
	Ref<AnimationLibrary> library;
	if (!p_animation_player->has_animation_library("")) {
		library.instantiate();
		p_animation_player->add_animation_library("", library);
	} else {
		library = p_animation_player->get_animation_library("");
	}
	library->add_animation(anim_name, animation);
}
void GLTFDocument::_convert_mesh_instances(Ref<GLTFState> p_state) {
	for (GLTFNodeIndex mi_node_i = 0; mi_node_i < p_state->nodes.size(); ++mi_node_i) {
		Ref<GLTFNode> node = p_state->nodes[mi_node_i];
		if (node->mesh < 0) {
			continue;
		}
		HashMap<GLTFNodeIndex, Node *>::Iterator mi_element = p_state->scene_nodes.find(mi_node_i);
		if (!mi_element) {
			continue;