### 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 
if (r_click_item) {
		*r_click_item = nullptr;
	}
	if (r_click_char != nullptr) {
		*r_click_char = 0;
	}
	if (r_outside != nullptr) {
		*r_outside = true;
	}
	Size2 size = get_size();
	Rect2 text_rect = _get_text_rect();
	int vofs = vscroll->get_value();
	
	int to_line = main->first_invalid_line.load();
	int from_line = _find_first_line(0, to_line, vofs);
	Point2 ofs = text_rect.get_position() + Vector2(0, main->lines[from_line].offset.y - vofs);
	while (ofs.y < size.height && from_line < to_line) {
		MutexLock lock(main->lines[from_line].text_buf->get_mutex());
		_find_click_in_line(p_frame, from_line, ofs, text_rect.size.x, p_click, r_click_frame, r_click_line, r_click_item, r_click_char, false, p_meta);
		ofs.y += main->lines[from_line].text_buf->get_size().y + main->lines[from_line].text_buf->get_line_count() * theme_cache.line_separation;
		if (((r_click_item != nullptr) && ((*r_click_item) != nullptr)) || ((r_click_frame != nullptr) && ((*r_click_frame) != nullptr))) {
			if (r_outside != nullptr) {
				*r_outside = false;
			}
			return;
		}
		from_line++;
	}
}
float RichTextLabel::_find_click_in_line(ItemFrame *p_frame, int p_line, const Vector2 &p_ofs, int p_width, const Point2i &p_click, ItemFrame **r_click_frame, int *r_click_line, Item **r_click_item, int *r_click_char, bool p_table, bool p_meta) {