Reproducible. You must provide a value in the pop-up Suggestions panel when a comment contains an ampersand as shown.
SAMPLE.
create or replace procedure p_ampersand
is
--add comment & ampersand
procedure np_nested_proc
is
begin
null;
end;
begin <
>
np_nested_proc;
dbms_output.put_line('main procedure executed');
end;
