### 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 *c_item = nullptr;
	bool outside;
	const_cast<RichTextLabel *>(this)->_find_click(main, p_pos, nullptr, nullptr, &c_item, nullptr, &outside, true);
	String description;
	if (c_item && !outside && const_cast<RichTextLabel *>(this)->_find_hint(c_item, &description)) {
		return description;
	} else {
		return Control::get_tooltip(p_pos);
	}
}
void RichTextLabel::_find_frame(Item *p_item, ItemFrame **r_frame, int *r_line) {