DBMS_JOB using dbms_alert.WaitOne in Oracle 19 does not work as expected

Hi all,

In our product we uses deprecated package DBMS_JOB to submit and run Jobs.

DBMS_JOB runs an expression:

begin package_1.func_1(); end;

package_1.func_1

executes a loop that runs dbms_alert.WaitOne() procedure in the loop. Something like that:

loop

dbms_alert.WaitOne();

end loop;

When I ran the DBMS_JOB on versions prior to 19c it had a message that it had been changed and the execution went to the background.

RDBMS 19c now migrates the DBMS_JOB to DBMS_SCHEDULER objects (creates a copy):

https://mikedietrichde.com/2019/05/24/dbms_job-behavior-change-in-oracle-19c-during-upgrade/

But when in 19c when I run it from old DBMS job or new Scheduler job there is no confirmation message that DBMS Job had been changed. It looks like the execution is hanging on.