### 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 
outline_size = subtag_a[1].to_int();
					} else if (subtag_a[0] == "color") {
						color = Color::from_string(subtag_a[1], color);
					} else if (subtag_a[0] == "outline_color") {
						outline_color = Color::from_string(subtag_a[1], outline_color);
					}
				}
			}
			int end = p_bbcode.find("[", brk_end);
			if (end == -1) {
				end = p_bbcode.length();
			}
			String dc_txt = p_bbcode.substr(brk_end + 1, end - brk_end - 1);
			push_dropcap(dc_txt, f, fs, dropcap_margins, color, outline_size, outline_color);
			pos = end;
			tag_stack.push_front(bbcode_name);
		} else if (tag.begins_with("img")) {
			int alignment = INLINE_ALIGNMENT_CENTER;
			if (tag.begins_with("img=")) {
				Vector<String> subtag = tag.substr(4, tag.length()).split(",");
				_normalize_subtags(subtag);
				if (subtag.size() > 1) {
					if (subtag[0] == "top" || subtag[0] == "t") {
						alignment = INLINE_ALIGNMENT_TOP_TO;
					} else if (subtag[0] == "center" || subtag[0] == "c") {
						alignment = INLINE_ALIGNMENT_CENTER_TO;
					} else if (subtag[0] == "bottom" || subtag[0] == "b") {
						alignment = INLINE_ALIGNMENT_BOTTOM_TO;
					}
					if (subtag[1] == "top" || subtag[1] == "t") {