Changing the add_rewrite_rule did the trick:
add_rewrite_rule('^periodicals/([^/]+)-'.$tlv['code'].'[/]?$', 'index.php?periodicals=$matches[1]&post_type=periodicals&name=$matches[1]&mlang='.$tlv['code'], 'top');
So, I assume for custom post types, using add_rewrite_rule with index.php as query need some extra query variables. A sample will be as:
add_rewrite_rule('^<custom_post_type>/([^/]+)-'.$tlv['code'].'[/]?$', 'index.php?<custom_post_type>=$matches[1]&post_type=<custom_post_type>&name=$matches[1]&mlang='.$tlv['code'], 'top');
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