tsvector not giving expected results on one host

Under PostgreSQL 12, I have a table using tsvector to search the column pkgmessage.

It looks like this (not all columns are shown).

Table "public.ports"
Column | Type | Collation | Nullable | Default
pkgmessage | text | | |
pkgmessage_textsearchable | tsvector | | | generated always as (to_tsvector('english'::regconfig, pkgmessage)) stored

On several servers, it works fine, like this:

freshports.devgit=# SELECT id as port_id, element_pathname(element_id)
FROM ports
WHERE pkgmessage_textsearchable2 @@ websearch_to_tsquery('example');
port_id | element_pathname
---------+----------------------------------------------------------------------
100421 | /ports/branches/2022Q1/dns/dnsmasq
100428 | /ports/branches/2022Q1/emulators/xsystem35
14686 | /ports/head/sysutils/lmon
... etc

On the problem server, production, we get nothing. Nada.

freshports.org=> SELECT id as port_id, element_pathname(element_id)
FROM ports
WHERE pkgmessage_textsearchable2 @@ websearch_to_tsquery('example');
port_id | element_pathname
---------+------------------
(0 rows)

freshports.org=>

However, ilike on the same database does find the matches:

freshports.org=> SELECT id as port_id, element_pathname(element_id)
FROM ports
WHERE pkgmessage ilike '%example%';
port_id | element_pathname
---------+----------------------------------------------------------------------
34126 | /ports/head/security/pond
74559 | /ports/branches/2015Q3/emulators/linux_base-c6
60310 | /ports/branches/2020Q4/www/gitlab-ce
38345 | /ports/head/www/gitlab
... etc

Both database are SQL_ASCII with the same Collate and Ctype settings.

Before composing this email, I ran "reindex table concurrently ports;" on the problem database. It did not change the results.

prod, has problem

List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
----------------+----------+-----------+-------------+-------------+-----------------------
freshports.org | postgres | SQL_ASCII | C | C |

dev, no issues:

[pg02 dan ~] % psql -l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------------------------+--------------+-----------+---------+-------+-----------------------
freshports.devgit | postgres | SQL_ASCII | C | C |

Any ideas as to what to search please?

Oh, one difference. All the working-as-expected databases are self-hosted on FreeBSD. The problem database is on AWS RDS.
--
Dan Langille
dan(at)langille(dot)org