### 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);
	ItemShake *item = memnew(ItemShake);
	item->strength = p_strength;
	item->rate = p_rate;
	item->connected = p_connected;
	_add_item(item, true);
}
void RichTextLabel::push_wave(float p_frequency = 1.0f, float p_amplitude = 10.0f, bool p_connected = true) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ItemWave *item = memnew(ItemWave);
	item->frequency = p_frequency;
	item->amplitude = p_amplitude;
	item->connected = p_connected;
	_add_item(item, true);
}
void RichTextLabel::push_tornado(float p_frequency = 1.0f, float p_radius = 10.0f, bool p_connected = true) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ItemTornado *item = memnew(ItemTornado);
	item->frequency = p_frequency;
	item->radius = p_radius;
	item->connected = p_connected;
	_add_item(item, true);
}
void RichTextLabel::push_rainbow(float p_saturation, float p_value, float p_frequency) {