account/login.php, account/logout.php: Issues with shortUrl & intro page

[instantflorian]

line 29 in login.php reads
$sRedirect = ($sRedirect != '') ? $sRedirect : WB_URL . ((INTRO_PAGE) ? PAGES_DIRECTORY : '') . '/index.php';
and accordingly logout.php, l.34ff
if (INTRO_PAGE) { header('Location: ' . WB_URL . PAGES_DIRECTORY . '/index.php'); }
what means, that in case of an activated intro page the user is redirected to wbcedomain.tld/pages/index.php. This is transformed by shortURL into wbcedomain.tld/index/, which leads into a 404 not found error.
Beside of this even on usual pages the pages/index.php is no real page, but just a redirect to wbcedomain.tld/index.php.

I think there was once an issue with an endless redirect in case of an activated intro page and a private/registered starting page, and to avoid this, the redirect to pages/index.php was choosen, but I think this solution actually has some disadvantages too.