DBMS_CLOUD.CREATE_CREDENTIAL fails with ORA-00600 [17287] in PDB.

DBMS_CLOUD.CREATE_CREDENTIAL fails with ORA-00600 [17287] in PDB.

DBMS_CLOUD package was installed on 19.28c with the help of this doc:

Environment:

• Oracle Database 19c
• Version 19.28.0.0.0
• DBMS_CLOUD is VALID in CDB$ROOT and PDB
• SSL_WALLET is set to /home/oracle/dbc/sslwallet
• HTTPS connectivity verified successfully with UTL_HTTP in CDB$ROOT and PDB
• ACLs granted to ROOT_USER in PDB
• CREATE CREDENTIAL privilege granted to ROOT_USER

Failure:
BEGIN
DBMS_CLOUD.CREATE_CREDENTIAL(
credential_name => 'CRED',
username => '<username>',
password => '<auth_token from oci>'
);
END;
/

Error:
ORA-00600: internal error code, arguments: [17287], [0x...], [0x0C633E898], [], [C##CLOUD$SERVICE], [DBMS_CLOUD], [11], [1], [], [], [], []