### 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);
	ERR_FAIL_COND(p_columns < 1);
	ItemTable *item = memnew(ItemTable);
	item->columns.resize(p_columns);
	item->total_width = 0;
	item->inline_align = p_alignment;
	item->align_to_row = p_align_to_row;
	for (int i = 0; i < (int)item->columns.size(); i++) {
		item->columns[i].expand = false;
		item->columns[i].expand_ratio = 1;
	}
	_add_item(item, true, false);
}
void RichTextLabel::push_fade(int p_start_index, int p_length) {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	ItemFade *item = memnew(ItemFade);
	item->starting_index = p_start_index;
	item->length = p_length;
	_add_item(item, true);
}
void RichTextLabel::push_shake(int p_strength = 10, float p_rate = 24.0f, bool p_connected = true) {