### 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->operation = BinaryOpNode::OP_ADDITION;
			operation->variant_op = Variant::OP_ADD;
			break;
		case GDScriptTokenizer::Token::MINUS:
			operation->operation = BinaryOpNode::OP_SUBTRACTION;
			operation->variant_op = Variant::OP_SUBTRACT;
			break;
		case GDScriptTokenizer::Token::STAR:
			operation->operation = BinaryOpNode::OP_MULTIPLICATION;
			operation->variant_op = Variant::OP_MULTIPLY;
			break;
		case GDScriptTokenizer::Token::SLASH:
			operation->operation = BinaryOpNode::OP_DIVISION;
			operation->variant_op = Variant::OP_DIVIDE;
			break;
		case GDScriptTokenizer::Token::PERCENT:
			operation->operation = BinaryOpNode::OP_MODULO;
			operation->variant_op = Variant::OP_MODULE;
			break;
		case GDScriptTokenizer::Token::STAR_STAR:
			operation->operation = BinaryOpNode::OP_POWER;
			operation->variant_op = Variant::OP_POWER;
			break;
		case GDScriptTokenizer::Token::LESS_LESS:
			operation->operation = BinaryOpNode::OP_BIT_LEFT_SHIFT;
			operation->variant_op = Variant::OP_SHIFT_LEFT;
			break;
		case GDScriptTokenizer::Token::GREATER_GREATER:
			operation->operation = BinaryOpNode::OP_BIT_RIGHT_SHIFT;
			operation->variant_op = Variant::OP_SHIFT_RIGHT;