### 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
ERR_THREAD_GUARD_V(0);
	_update_children_cache();
	if (p_include_internal) {
		return data.children_cache.size();
	} else {
		return data.children_cache.size() - data.internal_children_front_count_cache - data.internal_children_back_count_cache;
	}
}
Node *Node::get_child(int p_index, bool p_include_internal) const {
	ERR_THREAD_GUARD_V(nullptr);
	_update_children_cache();
	if (p_include_internal) {
		if (p_index < 0) {
			p_index += data.children_cache.size();
		}
		ERR_FAIL_INDEX_V(p_index, (int)data.children_cache.size(), nullptr);
		return data.children_cache[p_index];
	} else {
		if (p_index < 0) {
			p_index += (int)data.children_cache.size() - data.internal_children_front_count_cache - data.internal_children_back_count_cache;
		}
		ERR_FAIL_INDEX_V(p_index, (int)data.children_cache.size() - data.internal_children_front_count_cache - data.internal_children_back_count_cache, nullptr);
		p_index += data.internal_children_front_count_cache;
		return data.children_cache[p_index];
	}
}
TypedArray<Node> Node::get_children(bool p_include_internal) const {