pg_ls_waldir does not work on standy

Hi,

We see below error when running the function on a standby instance

postgres=# SELECT * FROM pg_ls_waldir()

postgres-# ;

ERROR: could not stat directory "pg_wal": No such file or directory

It works on a primary instance

Listing log directory works in both primary and standby

postgres=# select * from pg_ls_logdir();

name | size | modification

-------------------------+-----------+------------------------

postgresql-Fri.log | 274856244 | 2022-12-10 00:00:00+00

postgresql-Sat.log | 272873161 | 2022-12-11 00:00:00+00

postgresql-Thu.log | 274696376 | 2022-12-09 00:00:00+00

Thanks,

Nikhil