HPL/SQL says it support default value for parameters but not considering them when no value is passed

HPL/SQL says it support default value for parameters but not considering them when no value is passed.

CREATE OR replace PROCEDURE test123(a NUMBER DEFAULT -110)
AS
BEGIN
dbms_output.put_line (a);
end;

Oracle shows the default value-

SQL> call test123();
-110

Hive shows the variable name instead of the default value-

call test123();
INFO : a