### 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);
	ERR_FAIL_COND(current->type == ITEM_TABLE);
	ItemColor *item = memnew(ItemColor);
	item->color = p_color;
	_add_item(item, true);
}
void RichTextLabel::push_outline_color(const Color &p_color) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ERR_FAIL_COND(current->type == ITEM_TABLE);
	ItemOutlineColor *item = memnew(ItemOutlineColor);
	item->color = p_color;
	_add_item(item, true);
}
void RichTextLabel::push_underline() {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ERR_FAIL_COND(current->type == ITEM_TABLE);
	ItemUnderline *item = memnew(ItemUnderline);
	_add_item(item, true);
}
void RichTextLabel::push_strikethrough() {