### Godot version

master ([06ccbfe](https://github.com/godotengine/godot/commit/06ccbfe8eec6e840db3df2360dc2804386f940b8))

### System information

PopOS 22.04

### Issue description

Sometimes the doc page is broken when the engine is closed and then restarted.
Closing the doc and opening it again fixes it.

![2023-05-27_22-15](https://github.com/godotengine/godot/assets/3624853/ed202a55-03e8-420a-bc1c-ccfc7f7cd02a)


### Steps to reproduce

- Open a documentation page for any node
- Restart Godot

### Minimal reproduction project

NA

EDIT : Added the commit hash @Calinou 
Item *item = p_item;
	while (item) {
		if (item->type == ITEM_PARAGRAPH) {
			ItemParagraph *p = static_cast<ItemParagraph *>(item);
			return p->alignment;
		}
		item = item->parent;
	}
	return default_alignment;
}
TextServer::Direction RichTextLabel::_find_direction(Item *p_item) {
	Item *item = p_item;
	while (item) {
		if (item->type == ITEM_PARAGRAPH) {
			ItemParagraph *p = static_cast<ItemParagraph *>(item);
			if (p->direction != Control::TEXT_DIRECTION_INHERITED) {
				return (TextServer::Direction)p->direction;
			}
		}
		item = item->parent;
	}
	if (text_direction == Control::TEXT_DIRECTION_INHERITED) {
		return is_layout_rtl() ? TextServer::DIRECTION_RTL : TextServer::DIRECTION_LTR;
	} else {
		return (TextServer::Direction)text_direction;
	}
}
TextServer::StructuredTextParser RichTextLabel::_find_stt(Item *p_item) {