Failure to resolve column's name of recursive CTE in prepared mode.

create table  folks(id int, name char(32), dob date, father int, mother int);

insert into folks values

(100, 'Me', '2000-01-01', 20, 30),

(20, 'Dad', '1970-02-02', 10, 9),

(30, 'Mom', '1975-03-03', 8, 7),

(10, 'Grandpa Bill', '1940-04-05', null, null),

(9, 'Grandma Ann', '1941-10-15', null, null),

(25, 'Uncle Jim', '1968-11-18', 8, 7),

(98, 'Sister Amy', '2001-06-20', 20, 30),

(7, 'Grandma Sally', '1943-08-23', null, 6),

(8, 'Grandpa Ben', '1940-10-21', null, null),

(6, 'Grandgrandma Martha', '1923-05-17', null, null),

(67, 'Cousin Eddie', '1992-02-28', 25, 27),

(27, 'Auntie Melinda', '1971-03-29', null, null); 

prepare stmt from"

with recursive

ancestor_ids (id)

as

(

  select father from folks where name = 'Me'

  union

  select mother from folks where name = 'Me'

  union

  select father from folks, ancestor_ids a  where folks.id = a.id

  union

  select mother from folks, ancestor_ids a  where folks.id = a.id

)

select p.* from folks as p, ancestor_ids as a where p.id = a.id;

";

execute stmt;

MariaDB [test]> execute stmt;

ERROR 1054 (42S22): Unknown column 'a.id' in 'where clause'