### 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 
}
				add_image(texture, width, height, color, (InlineAlignment)alignment, region);
			}
			pos = end;
			tag_stack.push_front(bbcode_name);
		} else if (tag.begins_with("color=")) {
			String color_str = tag.substr(6, tag.length()).unquote();
			Color color = Color::from_string(color_str, theme_cache.default_color);
			push_color(color);
			pos = brk_end + 1;
			tag_stack.push_front("color");
		} else if (tag.begins_with("outline_color=")) {
			String color_str = tag.substr(14, tag.length()).unquote();
			Color color = Color::from_string(color_str, theme_cache.default_color);
			push_outline_color(color);
			pos = brk_end + 1;
			tag_stack.push_front("outline_color");
		} else if (tag.begins_with("font_size=")) {
			int fnt_size = tag.substr(10, tag.length()).to_int();
			push_font_size(fnt_size);
			pos = brk_end + 1;
			tag_stack.push_front("font_size");
		} else if (tag.begins_with("opentype_features=") || tag.begins_with("otf=")) {
			int value_pos = tag.find("=");
			String fnt_ftr = tag.substr(value_pos + 1);
			Vector<String> subtag = fnt_ftr.split(",");
			_normalize_subtags(subtag);
			if (subtag.size() > 0) {
				Ref<Font> font = theme_cache.normal_font;
				DefaultFont def_font = NORMAL_FONT;