BUG #17837: The potential risks associated with executing "commit" in a procedure.

The following bug has been logged on the website:

Bug reference: 17837
Logged by: Andre Lin
Email address: 857348270(at)qq(dot)com
PostgreSQL version: 12.14
Operating system: Linux x86_64 GNU/Linux
Description:

Recently, I have noticed that executing "commit" in a procedure calls
PreCommit_Portals in the kernel, which sets the resowner of the top level
portal to null. However, subsequent statements still use this portal, and
its resowner remains null. Is there any risk associated with this or could
it lead to unexpected behavior? If this is expected, how should I interpret
(or ... understand) portal->resowner? I would greatly appreciate your
guidance on this matter.

For example:

create or replace procedure p ()
as
$$
declare
vsql varchar := 'aa';
begin
for i in 1..10
loop
raise notice '%',i;
end loop;
commit;
for i in 1..10
loop
raise notice '%',i;
end loop;
commit;
end;
$$
language plpgsql;