shared_preload_libraries and pg_stat_statements

Hi all

In my postgresql.conf I have

shared_preload_libraries = 'pg_stat_statements, pg_shard' # (change requires restart)
pg_stat_statements.max = 10000
pg_stat_statements.track = all

The server restarts ok, created the extension fine, but

postgres=# select * from pg_stat_statements;
ERROR: pg_stat_statements must be loaded via shared_preload_libraries

And more

postgres=# SHOW shared_preload_libraries;
shared_preload_libraries
--------------------------
pg_shard
(1 row)

postgres=# select * from pg_extension;
extname | extowner | extnamespace | extrelocatable | extversion | extconfig | extcondition
--------------------+----------+--------------+----------------+------------+---------------------+--------------
plpgsql | 10 | 11 | f | 1.0 | |
pg_shard | 10 | 2200 | t | 1.1 | {16661,16669,16682} | {"","",""}
pg_stat_statements | 10 | 2200 | t | 1.2 | |

Could it be a collision from pg_shard and pg_stat_statements from the same value of extnamespace ?

Thanks
-- Armand