### 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 
#ifndef R
#define R
#include "core/object/worker_thread_pool.h"
#include "rich_text_effect.h"
#include "scene/gui/popup_menu.h"
#include "scene/gui/scroll_bar.h"
#include "scene/resources/text_paragraph.h"
class RichTextLabel : public Control {
	GDCLASS(RichTextLabel, Control);
public:
	enum ListType {
		LIST_NUMBERS,
		LIST_LETTERS,
		LIST_ROMAN,
		LIST_DOTS
	};
	enum ItemType {