BUG #18251: Incorrect DROP VIEW pg_catalog.* behavior

The following bug has been logged on the website:

Bug reference: 18251
Logged by: Vardan Pogosyan
Email address: vardan(dot)pogosyn(at)yandex(dot)ru
PostgreSQL version: 15.5
Operating system: Ubuntu 22.04
Description:

Hello!

When i try to drop and create system view, i get following behavior:

postgres=# DROP VIEW pg_catalog.pg_config;
DROP VIEW

postgres=# CREATE OR REPLACE VIEW pg_catalog.pg_config AS
SELECT pg_config.name, pg_config.setting
FROM pg_config() pg_config(name, setting);
ERROR: permission denied to create "pg_catalog.pg_config"
DETAIL: System catalog modifications are currently disallowed.

I'm not sure, but it's look strange.
When i connect to template1, i can use droped views. But if drop view on
template1 problem repeats.

I find it on the PostgreSQL 16, 15, 14 (i didn't try on others).