### 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
_stop_thread();
	MutexLock data_lock(data_mutex);
	ItemRainbow *item = memnew(ItemRainbow);
	item->frequency = p_frequency;
	item->saturation = p_saturation;
	item->value = p_value;
	_add_item(item, true);
}
void RichTextLabel::push_bgcolor(const Color &p_color) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ERR_FAIL_COND(current->type == ITEM_TABLE);
	ItemBGColor *item = memnew(ItemBGColor);
	item->color = p_color;
	_add_item(item, true);
}
void RichTextLabel::push_fgcolor(const Color &p_color) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ERR_FAIL_COND(current->type == ITEM_TABLE);
	ItemFGColor *item = memnew(ItemFGColor);
	item->color = p_color;
	_add_item(item, true);
}
void RichTextLabel::push_customfx(Ref<RichTextEffect> p_custom_effect, Dictionary p_environment) {