### 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 
p_item->parent = current;
	p_item->E = current->subitems.push_back(p_item);
	p_item->index = current_idx++;
	p_item->char_ofs = current_char_ofs;
	if (p_item->type == ITEM_TEXT) {
		ItemText *t = static_cast<ItemText *>(p_item);
		current_char_ofs += t->text.length();
	} else if (p_item->type == ITEM_IMAGE) {
		current_char_ofs++;
	}
	if (p_enter) {
		current = p_item;
	}
	if (p_ensure_newline) {
		Item *from = current_frame->lines[current_frame->lines.size() - 1].from;
		
		if (_find_layout_subitem(from, p_item)) {
			_invalidate_current_line(current_frame);
			current_frame->lines.resize(current_frame->lines.size() + 1);
		}
	}
	if (current_frame->lines[current_frame->lines.size() - 1].from == nullptr) {
		current_frame->lines[current_frame->lines.size() - 1].from = p_item;
	}
	p_item->line = current_frame->lines.size() - 1;