### Godot version

4.1.rc.custom_build. c83f912bc

### System information

Ubuntu 22.04 CI

### Issue description

When executing
```
extends Node
func _process(delta):

	var temp_variable35241 = RichTextLabel.new()
	add_child(temp_variable35241)
	temp_variable35241.set_fit_content(true)
	temp_variable35241.parse_bbcode("3188932498")
	temp_variable35241.queue_free()
```
this code freeze project in CI for at least 60 seconds

### Steps to reproduce

Above

### Minimal reproduction project

N/A
theme_cache.table_h_separation = get_theme_constant(SNAME("table_h_separation"));
	theme_cache.table_v_separation = get_theme_constant(SNAME("table_v_separation"));
	theme_cache.table_odd_row_bg = get_theme_color(SNAME("table_odd_row_bg"));
	theme_cache.table_even_row_bg = get_theme_color(SNAME("table_even_row_bg"));
	theme_cache.table_border = get_theme_color(SNAME("table_border"));
	theme_cache.base_scale = get_theme_default_base_scale();
}
void RichTextLabel::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_MOUSE_EXIT: {
			if (meta_hovering) {
				meta_hovering = nullptr;
				emit_signal(SNAME("meta_hover_ended"), current_meta);
				current_meta = false;
				queue_redraw();
			}
		} break;
		case NOTIFICATION_RESIZED: {
			_stop_thread();
			main->first_resized_line.store(0); 
			queue_redraw();
		} break;
		case NOTIFICATION_THEME_CHANGED: {
			_stop_thread();
			main->first_invalid_font_line.store(0); 
			queue_redraw();
		} break;
		case NOTIFICATION_ENTER_TREE: {
			_stop_thread();
			if (!text.is_empty()) {