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The following bug has been logged on the website:

Bug reference:      18545
Logged by:          Andrey Rachitskiy
Email address:      therealgofman@mail.ru
PostgreSQL version: 16.3
Operating system:   Debian 12
Description:        

\dt breaks transaction, calling error when executed in SET SESSION
AUTHORIZATION. This happens in two cases, with different SET.

Case one:
postgres@debian-test:~$ psql -U postgres
psql (16.3)
Type "help" for help.

postgres=# \set VERBOSITY verbose
postgres=# BEGIN;
BEGIN
postgres=*# CREATE USER regress_priv_user8;
CREATE ROLE
postgres=*# SET SESSION AUTHORIZATION regress_priv_user8;
SET
postgres=*> \dt+;
Did not find any relations.
postgres=*> SET LOCAL debug_parallel_query = 1;
SET
postgres=*> \dt+;
ERROR:  22023: role "regress_priv_user8" does not exist
CONTEXT:  while setting parameter "session_authorization" to
"regress_priv_user8"
parallel worker
LOCATION:  call_string_check_hook, guc.c:6734
postgres=!# 
\q

Case two:
postgres@debian-test:~$ psql -U postgres
psql (16.3)
Type "help" for help.

postgres=# \set VERBOSITY verbose
postgres=# BEGIN;
BEGIN
postgres=*# CREATE USER regress_priv_user8;
CREATE ROLE
postgres=*# SET SESSION AUTHORIZATION regress_priv_user8;
SET
postgres=*> \dt+
Did not find any relations.
postgres=*> set local parallel_setup_cost = 0;
SET
postgres=*> set local min_parallel_table_scan_size = 0;
SET
postgres=*> \dt+
ERROR:  22023: role "regress_priv_user8" does not exist
CONTEXT:  while setting parameter "session_authorization" to
"regress_priv_user8"
parallel worker
LOCATION:  call_string_check_hook, guc.c:6734
postgres=!# 
\q