### Godot version

4.0.2

### System information

Windows 10

### Issue description

EDIT: this was fixed by removing the offending files listed with the MRP and then dragging them back in from my desktop after opening the project~

I was developing my game then suddenly this started happening. I can no longer playtest my game.
I am not 100% sure what caused this but I believe at the time I was making a new inherited scene, saved it, then moved some scenes in the FileSystem tab?

![image](https://user-images.githubusercontent.com/75141902/235264827-62419c7d-963b-4002-9452-a6493a9bfe25.png)


### Steps to reproduce

No idea aaa- x-x

### Minimal reproduction project

Since I have no idea what caused it here's my early project :'D
https://drive.google.com/file/d/14JFZ420AelUNjBIth78msHY29rNjB55_/view?usp=share_link

I was working on these when the error occurred:
- Slot_0.tcsn
- Slot_Clickable.tscn
- Slot_Orphan.tscn
- Slot_Orphan.gd

ClassNode *n_class = alloc_node<ClassNode>();
	ClassNode *previous_class = current_class;
	current_class = n_class;
	n_class->outer = previous_class;
	if (consume(GDScriptTokenizer::Token::IDENTIFIER, R"(Expected identifier for the class name after "class".)")) {
		n_class->identifier = parse_identifier();
		if (n_class->outer) {
			String fqcn = n_class->outer->fqcn;
			if (fqcn.is_empty()) {
				fqcn = script_path;
			}
			n_class->fqcn = fqcn + "::" + n_class->identifier->name;
		} else {
			n_class->fqcn = n_class->identifier->name;
		}
	}
	if (match(GDScriptTokenizer::Token::EXTENDS)) {
		parse_extends();
	}
	consume(GDScriptTokenizer::Token::COLON, R"(Expected ":" after class declaration.)");
	bool multiline = match(GDScriptTokenizer::Token::NEWLINE);
	if (multiline && !consume(GDScriptTokenizer::Token::INDENT, R"(Expected indented block after class declaration.)")) {
		current_class = previous_class;
		complete_extents(n_class);
		return n_class;
	}
	if (match(GDScriptTokenizer::Token::EXTENDS)) {
		if (n_class->extends_used) {