HAS_TABLE_PRIVILEGE query failing

Hi,
I use the Redshift admin views for quite a lot, and noticed that at least one of them no longer works for some reason. I'm unsure if it's due to a recent maintenance period or something else. The view in question is: https://github.com/awslabs/amazon-redshift-utils/blob/master/src/AdminViews/v_get_tbl_priv_by_user.sql

Here's the error I get

ERROR:  3F000: schema "pg_temp_118" does not exist
LOCATION:  LookupExplicitNamespace, /home/ec2-user/padb/src/pg/src/backend/catalog/namespace.c:1338

I distilled the query down to this, and it still fails:

SELECT
        schemaname
        ,tablename
        ,HAS_TABLE_PRIVILEGE('admin', schemaname || '.' || tablename, 'select') AS sel
FROM pg_tables;

Removing the cross join (and almost everything else) didn't fix it. However, it works if I remove the HAS_TABLE_PRIVILEGE field, so it appears to be a problem with that function.