Why can't refactor extract method "switch case" statement begins with the comment

I have sample code:

```php

<?php

$test = 'case';

switch ($test) {
    case 'foo':
        // comment
        echo 'foofoo';
        break;
    case 'bar':
        echo 'barbar';
        break;
}

```

I want to refactor the "switch case" extract method statement

I can extract method case 'bar' to function 'barbar', but I can not extract method case 'foo' because that has comments of begin.

env:
PhpStorm 2018.3.4