BUG #16548: Order by on array element giving disparity in result

The following bug has been logged on the website:

Bug reference: 16548
Logged by: Manvendra Panwar
Email address: manvendra2525(at)gmail(dot)com
PostgreSQL version: 12.2
Operating system: Ubuntu 18.04.1 LTS
Description:

create table bint (a int[]);
insert into bint values (array[14]);
insert into bint values (array[14]);
insert into bint values (array[10]);
insert into bint values (array[10,14,14,14]);
insert into bint values (array[10,14,10,10]);
insert into bint values (array[14,14,10,14]);
insert into bint values (array[10,14,14,14]);
insert into bint values (array[10,14]);
insert into bint values (array[10,14]);
insert into bint values (array[14,14,14,14]);
insert into bint values (array[10,14,10,10]);
insert into bint values (array[10,14]);
insert into bint values (array[10,14]);
insert into bint values (array[10,14]);
insert into bint values (array[10,14]);
insert into bint values (array[10,14]);
insert into bint values (array[14,14,14,10]);
insert into bint values (array[14,14,14,10]);
insert into bint values (array[14,14,14,14]);
insert into bint values (array[10,14]);
insert into bint values (array[10,14]);
insert into bint values (array[10,14,14,14]);
insert into bint values (array[10,14]);
commit;

postgres=# select * from bint order by a[2] desc;
a
---------------
{14}
{14}
{10}
{10,14,14,14}
{10,14,10,10}
{14,14,10,14}
{10,14,14,14}
{10,14}
{10,14}
{14,14,14,14}
{10,14,10,10}
{10,14}
{10,14}
{10,14}
{10,14}
{10,14}
{14,14,14,10}
{14,14,14,10}
{14,14,14,14}
{10,14}
{10,14}
{10,14,14,14}
{10,14}
(23 rows)

postgres=# select * from bint order by a[2] desc limit 5;
a
---------------
{14}
{10}
{14}
{10,14,10,10}
{10,14,14,14}
(5 rows)