Count(Distinct) + Having ==> Empty Result

DROP TABLE if EXISTS WORK.MyTVShows ;
CREATE TABLE WORK.MyTVShows (tconst CHAR(10)) ;
INSERT INTO WORK.MyTVShows (tconst) VALUES ('tt0898266') ;

DROP TABLE if EXISTS WORK.Episodes ;
CREATE TABLE WORK.Episodes (tconst CHAR(10), parentTconst CHAR(10)) ;
INSERT INTO WORK.Episodes (tconst, parentTconst) VALUES ('tt0775431', 'tt0898266'), ('tt1091289', 'tt0898266') ;

DROP TABLE if EXISTS WORK.ActingRoles ;
CREATE TABLE WORK.ActingRoles (tconst CHAR(10), nconst CHAR(10), voice CHAR(1)) ;
INSERT INTO WORK.ActingRoles (tconst, nconst, voice) VALUES ('tt0775431', 'nm0192505', ' '), ('tt1091289', 'nm0192505', ' ') ;

DROP TABLE if EXISTS WORK.Artists ;
CREATE TABLE WORK.Artists (nconst CHAR(10), primaryName VARCHAR(128), gender CHAR(1)) ;
INSERT INTO WORK.Artists (nconst, primaryName, gender) VALUES ('nm0192505', 'Kaley Cuoco', 'F') ;

1. Distinct + Having ==> Empty Result

SELECT d.nconst, d.primaryName,
COUNT(b.tconst) AS nbrEpisode,
COUNT(distinct b.parentTconst) AS nbrShow,
RANK() OVER (ORDER BY nbrEpisode desc) as actRank
FROM WORK.MyTVShows a,
WORK.Episodes b,
WORK.ActingRoles c,
WORK.Artists d
WHERE a.tconst = b.parentTconst
AND b.tconst = c.tconst
AND c.nconst = d.nconst
AND c.voice NOT IN ("C", "D")
AND d.gender = "F"
GROUP BY d.nconst, d.primaryName
HAVING nbrEpisode >= 1
ORDER BY actRank, d.primaryName ;

1. Distinct without Having ==> Works, but I want Having clause

SELECT d.nconst, d.primaryName,
COUNT(b.tconst) AS nbrEpisode,
COUNT(distinct b.parentTconst) AS nbrShow,
RANK() OVER (ORDER BY nbrEpisode desc) as actRank
FROM WORK.MyTVShows a,
WORK.Episodes b,
WORK.ActingRoles c,
WORK.Artists d
WHERE a.tconst = b.parentTconst
AND b.tconst = c.tconst
AND c.nconst = d.nconst
AND c.voice NOT IN ("C", "D")
AND d.gender = "F"
GROUP BY d.nconst, d.primaryName
ORDER BY actRank, d.primaryName ;

1. Having without Distinct ==> Works, but I need Distinct to obtain desired result

SELECT d.nconst, d.primaryName,
COUNT(b.tconst) AS nbrEpisode,
COUNT(b.parentTconst) AS nbrShow,
RANK() OVER (ORDER BY nbrEpisode desc) as actRank
FROM WORK.MyTVShows a,
WORK.Episodes b,
WORK.ActingRoles c,
WORK.Artists d
WHERE a.tconst = b.parentTconst
AND b.tconst = c.tconst
AND c.nconst = d.nconst
AND c.voice NOT IN ("C", "D")
AND d.gender = "F"
GROUP BY d.nconst, d.primaryName
HAVING nbrEpisode >= 1
ORDER BY actRank, d.primaryName ;