pg_collation_actual_version() ERROR: cache lookup failed for collation 123

As of 257836a75, this returns:

|postgres=# SELECT pg_collation_actual_version(123);
|ERROR: cache lookup failed for collation 123
|postgres=# \errverbose
|ERROR: XX000: cache lookup failed for collation 123
|LOCATION: get_collation_version_for_oid, pg_locale.c:1754

I'm of the impression that's considered to be a bad behavior for SQL accessible
functions.

In v13, it did the same thing but with different language:

|ts=# SELECT pg_collation_actual_version(123);
|ERROR: collation with OID 123 does not exist
|ts=# \errverbose
|ERROR: 42704: collation with OID 123 does not exist
|LOCATION: pg_collation_actual_version, collationcmds.c:367

--
Justin