### 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 (p_region.has_area()) {
				item->size.height = p_region.get_size().height * p_width / p_region.get_size().width;
			} else {
				item->size.height = p_image->get_height() * p_width / p_image->get_width();
			}
		}
	} else {
		if (p_height > 0) {
			
			item->size.height = p_height;
			
			if (p_region.has_area()) {
				item->size.width = p_region.get_size().width * p_height / p_region.get_size().height;
			} else {
				item->size.width = p_image->get_width() * p_height / p_image->get_height();
			}
		} else {
			if (p_region.has_area()) {
				
				item->size = p_region.get_size();
			} else {
				
				item->size = p_image->get_size();
			}
		}
	}
	_add_item(item, false);
}
void RichTextLabel::add_newline() {