Can't drop logical replication slot

Hi all,

while trying to setup a new logical replication with a master, which
was a physical replication slave (and is now a master), I get:

operations=# SELECT * FROM pg_replication_slots;
 slot_name  |  plugin  | slot_type | datoid |  database  | temporary | active | active_pid | xmin | catalog_xmin |
restart_lsn | confirmed_flush_lsn 

------------+----------+-----------+--------+------------+-----------+--------+------------+------+--------------+--------------+---------------------
 meteo_ddb4 | pgoutput | logical   |  18360 | operations | f         | f      |            |      |    180762192 |
2C2/6CB2FB50| 2C2/6CB2FB88 
 meteo_ddb5 | pgoutput | logical   |  18360 | operations | f         | f      |            |      |    180762192 |
2C2/6CB2FB88| 2C2/6CB2FBC0 
(2 rows)

Time: 2,435 ms
operations=# select * from pg_drop_replication_slot('meteo_dbb5');
ERROR:  replication slot "meteo_dbb5" does not exist
Time: 1,556 ms
operations=#

How can I fix this?
Subscription on the other end has been dropped.

Any help appreciated,
Axel
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PGP-Key: CDE74120  ☀  computing @ chaos claudius