pg_cron jobs are not being executed

We have installed **pg_cron** extension on PostgreSQL 13 database. postgresql.conf file:

shared_preload_libraries = 'pg_cron'
cron.database_name = 'pg_cron_db_name'

Also we enabled trust authentication for connections coming from localhost in pg_hba.conf:

#IPv4 local connections:
host   db_name    postgres,pg_cron_user    127.0.0.1/32         trust
host   all        all                      0.0.0.0/0            md5

We have run this query from postgres user to schedule a simple job for a database db_name (other than the one **pg_cron** was installed in):

-sql
SELECT cron.schedule_in_database('job1', '5,10,20,30 17 * * *', $$SELECT 1$$, 'db_name');

Everythings works fine on our staging database. \ But on our production DB the job is never executed. Table cron.job_run_details is empty and there are no entries in a logfile (even error ones).\ Versions of production and staging DBs are the same. We performed identical steps to set up **pg_cron**. The only difference we can think of is that staging DB is running on on-premise server while production DB is running on Azure's virtual machine. We tried to switch to unix domain socket to allow connections from localhost by running:

-sql
UPDATE cron.job SET nodename = '' WHERE jobid = ;

This helped, but temporarily. Job has been successfully executed three times and after that stopped to run again. Any ideas on how to solve this problem are appreciated.