Re: BUG #16843: pg_upgrade from 12.5 to 13.1 with extension plperlu failed

Hello, (third trial)

to clearify,
- plperl package is already installed (see below).
- command 'CREATE OR REPLACE PROCEDURAL LANGUAGE "plperlu";' doesn't create a
language object, but just an extension object (see below)

Output from failed database upgrade:
botdb=# \dL
Liste der Sprachen
Name | Eigentümer | Vertraut | Beschreibung
---------+------------+----------+------------------------------
plpgsql | postgres | t | PL/pgSQL procedural language
(1 Zeile)

botdb=# \dx
Liste der installierten Erweiterungen
Name | Version | Schema | Beschreibung
--------------+---------+------------
+--------------------------------------------------
hstore | 1.5 | pg_catalog | data type for storing sets of (key,
value) pairs
pg_cron | 4.0.4 | public | Cron-like Job Scheduler for PostgreSQL
pg_http | 1.4.1 | public | A web service for PostgreSQL
pg_mqtt | 1.1 | public | A mqtt client daemon for PostgreSQL
pg_reporting | 1.1 | public | A reporting extension for PostgreSQL
plperlu | 1.0 | pg_catalog | PL/PerlU untrusted procedural language
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language

best regards

Thomas Steffen