Query not covered when query parameter avialble

CREATE INDEX ix20 ON default ( DISTINCT ARRAY r.bid FOR r IN responses END, _type, createdAt) ;

EXPLAIN SELECT RAW meta().id

FROM `default`

WHERE `_type` = 'AppLead'

  AND `createdAt` >= '2019-08-28'

  AND ANY `item` IN `responses` SATISFIES `item`.`bid` = 'BidRegistration::1234' END;

EXPLAIN SELECT RAW meta().id

FROM `default`

WHERE `_type` = $q1

  AND `createdAt` >= $q2

  AND ANY `item` IN `responses` SATISFIES `item`.`bid` = $q3 END;

\set -$q1 'AppLead';

\set -$q2 '2019-08-28';

\set -$q3 'BidRegistration::1234';

EXPLAIN SELECT RAW meta().id

FROM `default`

WHERE `_type` = $q1

  AND `createdAt` >= $q2

  AND ANY `item` IN `responses` SATISFIES `item`.`bid` = $q3 END;