Cannot dbms_output.put_line after changing container

@demo2

Hi

Oracle 19c

I have cdb and single pdb named pdb1

demo1.sql

set serveroutput on;--set verify off;begindbms_output.put_line('before');execute immediate 'alter session set container=&1';dbms_output.put_line('after');END;/exit;

$ sqlplus -s / as sysdba @demo2.sql pdb1old   3: execute immediate 'alter session set container=&1';new   3: execute immediate 'alter session set container=pdb1';PL/SQL procedure successfully completed.

When I comment or remove this execute immediate.

demo2.sql

set serveroutput on;--set verify off;begindbms_output.put_line('before');dbms_output.put_line('after');END;/exit;

$ sqlplus -s / as sysdba @demo1