Why does the 2nd call show an OID instead of the name of the table?

issue_example.sql

drop schema if exists issue_repo cascade;
create schema issue_repo; set schema 'issue_repo';

create or replace procedure caller1 () as $proc$
  begin call nameit('t'); end;
$proc$ language plpgsql;

create or replace procedure nameit (target regclass) as $proc$
  begin raise notice '👻 target: %', target; end;
$proc$ language plpgsql;

create table t();
call caller1();
drop table t;
create table t();
call caller1();

related info: https://gist.github.com/PostgreSqlStan/9329a0f6d4f5383153c70833bf4a677a