### Godot version

v4.0.beta13.official [caacade56]

### System information

Windows 8.1

### Issue description

The `Unreachable code (statement after return) in function 'function_name()'` warning is given for functions that do not have unreachable code. The same code does not give this warning in v3.5.stable.official [991bb6ac7].

### Steps to reproduce

```
func warning(i: int) -> void:
  if i == 0:
    pass
  elif i == 1:
    return
  else:
    return
  print("yeah")
```

Removing either the `elif` or the `else` removes the warning.

### Minimal reproduction project

N/A; code in reproduction steps can be placed in any blank gdscript file to trigger the error.
operation->operand = parse_precedence(PREC_SIGN, false);
			if (operation->operand == nullptr) {
				push_error(R"(Expected expression after "+" operator.)");
			}
			break;
		case GDScriptTokenizer::Token::TILDE:
			operation->operation = UnaryOpNode::OP_COMPLEMENT;
			operation->variant_op = Variant::OP_BIT_NEGATE;
			operation->operand = parse_precedence(PREC_BIT_NOT, false);
			if (operation->operand == nullptr) {
				push_error(R"(Expected expression after "~" operator.)");
			}
			break;
		case GDScriptTokenizer::Token::NOT:
		case GDScriptTokenizer::Token::BANG:
			operation->operation = UnaryOpNode::OP_LOGIC_NOT;
			operation->variant_op = Variant::OP_NOT;
			operation->operand = parse_precedence(PREC_LOGIC_NOT, false);
			if (operation->operand == nullptr) {
				push_error(vformat(R"(Expected expression after "%s" operator.)", op_type == GDScriptTokenizer::Token::NOT ? "not" : "!"));
			}
			break;
		default:
			complete_extents(operation);
			return nullptr; 
	}
	complete_extents(operation);
	return operation;
}
GDScriptParser::ExpressionNode *GDScriptParser::parse_binary_not_in_operator(ExpressionNode *p_previous_operand, bool p_can_assign) {