Error with pg_dump (of data), with --role

Hi. I'm trying to do a data dump with pg_dump using RLS and --set-role,
but am getting an error, and I'm not understanding why. With this command,
run as postgres:

pg_dump -p 5433 -O --role=rcafe_TACOMA --enable-row-security
--column-inserts -a -f ~/ag_tacoma_data.pg_dump ag_rcafe

I get
[Multiple notices about circular foreign keys, like this, which I don't
think are directly-relevant]
NOTICE: there are circular foreign-key constraints among these tables:
pg_dump: tbl_client
pg_dump: tbl_l_veteran_status
pg_dump: tbl_staff
pg_dump: You might not be able to restore the dump without using
--disable-triggers or temporarily dropping the constraints.
pg_dump: Consider using a full dump instead of a --data-only dump to avoid
this problem.

But then crash out with:

pg_dump: [archiver (db)] query failed: ERROR: function
has_segment_access(character varying, name) does not exist
LINE 3: SELECT has_segment_access(segment,current_user);
^
HINT: No function matches the given name and argument types. You might
need to add explicit type casts.
QUERY:

SELECT has_segment_access(segment,current_user);

CONTEXT: SQL function "has_segment_access" during inlining
pg_dump: [archiver (db)] query was: DECLARE _pg_dump_cursor CURSOR FOR
SELECT * FROM ONLY public.tbl_client

Which I don't get. That function does exist, and is callable by both
postgres and the ag_TACOMA users.

ag_rcafe=# \df has_segment_access
List of functions
Schema | Name | Result data type | Argument data
types | Type
--------+--------------------+------------------+-----------------------------------------+--------
public | has_segment_access | boolean | segment character varying
| normal
public | has_segment_access | boolean | segment character
varying, db_user name | normal
public | has_segment_access | boolean | segments character
varying[] | normal
(3 rows)

ag_rcafe=# SELECT current_user,has_segment_access('TACOMA',current_user);
current_user | has_segment_access
--------------+--------------------
postgres | f
(1 row)

ag_rcafe=# SET ROLE "rcafe_TACOMA";
SET
ag_rcafe=> SELECT current_user,has_segment_access('TACOMA',current_user);
current_user | has_segment_access
--------------+--------------------
rcafe_TACOMA | t
(1 row)

So if the error means what it says, I don't get why. It would make more
sense to me if there were a restore, with an issue about how to sequence
the creation of things. But since it's a dump, shouldn't everything just
be there?

Any help appreciated. More info & context below.

Thanks.

Ken

version: 9.6.20
This database is about 8 years old, and has been through one if not two
upgrades, which I mention to say who knows what weirdness or cruft (or
corruption?) might have crept in.

It's a multi-tenant DB using RLS so that each tenant can only see their own
data. One of the tenants needs to have their data created in a separate
database. My initial take on how to do this was to dump the schema as
postgres, and then dump the data as the particular user. (ag_TACOMA). But
I haven't gotten very far with that. :)

There is only one schema, public.

--
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