### 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
outline_size = subtag_a[1].to_int();
					} else if (subtag_a[0] == "color") {
						color = Color::from_string(subtag_a[1], color);
					} else if (subtag_a[0] == "outline_color") {
						outline_color = Color::from_string(subtag_a[1], outline_color);
					}
				}
			}
			int end = p_bbcode.find("[", brk_end);
			if (end == -1) {
				end = p_bbcode.length();
			}
			String dc_txt = p_bbcode.substr(brk_end + 1, end - brk_end - 1);
			push_dropcap(dc_txt, f, fs, dropcap_margins, color, outline_size, outline_color);
			pos = end;
			tag_stack.push_front(bbcode_name);
		} else if (tag.begins_with("img")) {
			int alignment = INLINE_ALIGNMENT_CENTER;
			if (tag.begins_with("img=")) {
				Vector<String> subtag = tag.substr(4, tag.length()).split(",");
				_normalize_subtags(subtag);
				if (subtag.size() > 1) {
					if (subtag[0] == "top" || subtag[0] == "t") {
						alignment = INLINE_ALIGNMENT_TOP_TO;
					} else if (subtag[0] == "center" || subtag[0] == "c") {
						alignment = INLINE_ALIGNMENT_CENTER_TO;
					} else if (subtag[0] == "bottom" || subtag[0] == "b") {
						alignment = INLINE_ALIGNMENT_BOTTOM_TO;
					}
					if (subtag[1] == "top" || subtag[1] == "t") {