### 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

token_type = GDScriptTokenizer::Token::IDENTIFIER;
	}
	ParseFunction prefix_rule = get_rule(token_type)->prefix;
	if (prefix_rule == nullptr) {
		
		return nullptr;
	}
	advance(); 
	ExpressionNode *previous_operand = (this->*prefix_rule)(nullptr, p_can_assign);
	while (p_precedence <= get_rule(current.type)->precedence) {
		if (previous_operand == nullptr || (p_stop_on_assign && current.type == GDScriptTokenizer::Token::EQUAL) || lambda_ended) {
			return previous_operand;
		}
		
		switch (current.type) {
			
			case GDScriptTokenizer::Token::PARENTHESIS_OPEN:
			case GDScriptTokenizer::Token::BRACKET_OPEN:
				push_multiline(true);
				break;
			default:
				break; 
		}
		token = advance();
		ParseFunction infix_rule = get_rule(token.type)->infix;
		previous_operand = (this->*infix_rule)(previous_operand, p_can_assign);
	}
	return previous_operand;
}
GDScriptParser::ExpressionNode *GDScriptParser::parse_expression(bool p_can_assign, bool p_stop_on_assign) {