### Godot version

v4.1.rc1.official [1f9e540f1]

### System information

Windows 10

### Issue description

Attempting to reorder the children of a TabContainer results in an unintended ordering and incorrect undo states.

Also happens in v4.0.3.stable.official [5222a99f5].

https://github.com/godotengine/godot/assets/3820082/2c2458e3-88ad-46d9-8a04-f289a049984a



### Steps to reproduce

1. Add a new TabContainer
2. Add a few children to it
3. Drag and drop to erroneously reorder them
4. Attempt to undo the change

### Minimal reproduction project

N/A
if (current->data.owned_unique_nodes.size()) {
				
				Node **unique = current->data.owned_unique_nodes.getptr(name);
				if (!unique) {
					return nullptr;
				}
				next = *unique;
			} else if (current->data.owner) {
				Node **unique = current->data.owner->data.owned_unique_nodes.getptr(name);
				if (!unique) {
					return nullptr;
				}
				next = *unique;
			} else {
				return nullptr;
			}
		} else {
			next = nullptr;
			const Node *const *node = current->data.children.getptr(name);
			if (node) {
				next = const_cast<Node *>(*node);
			} else {
				return nullptr;
			}
		}
		current = next;
	}
	return current;
}
Node *Node::get_node(const NodePath &p_path) const {