### 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 
for (int i = 0; i < gl_size; i++) {
			bool selected = selection.active && (sel_start != -1) && (glyphs[i].start >= sel_start) && (glyphs[i].end <= sel_end);
			Item *it = _get_item_at_pos(it_from, it_to, glyphs[i].start);
			Color font_color = _find_color(it, p_base_color);
			if (_find_underline(it) || (_find_meta(it, nullptr) && underline_meta)) {
				if (!ul_started) {
					ul_started = true;
					ul_start = p_ofs + Vector2(off.x, off.y);
					ul_color = font_color;
					ul_color.a *= 0.5;
				}
			} else if (ul_started) {
				ul_started = false;
				float y_off = TS->shaped_text_get_underline_position(rid);
				float underline_width = MAX(1.0, TS->shaped_text_get_underline_thickness(rid) * theme_cache.base_scale);
				draw_line(ul_start + Vector2(0, y_off), p_ofs + Vector2(off.x, off.y + y_off), ul_color, underline_width);
			}
			if (_find_hint(it, nullptr) && underline_hint) {
				if (!dot_ul_started) {
					dot_ul_started = true;
					dot_ul_start = p_ofs + Vector2(off.x, off.y);
					dot_ul_color = font_color;
					dot_ul_color.a *= 0.5;
				}
			} else if (dot_ul_started) {
				dot_ul_started = false;
				float y_off = TS->shaped_text_get_underline_position(rid);
				float underline_width = MAX(1.0, TS->shaped_text_get_underline_thickness(rid) * theme_cache.base_scale);
				draw_dashed_line(dot_ul_start + Vector2(0, y_off), p_ofs + Vector2(off.x, off.y + y_off), dot_ul_color, underline_width, MAX(2.0, underline_width * 2));
			}