BUG #18892: When the view already exists, CREATE OR REPLACE VIEW does not check whether the table exists.

The following bug has been logged on the website:

Bug reference:      18892
Logged by:          Gavin
Email address:      gchen@s2now.com
PostgreSQL version: 16.8
Operating system:   Red Hat Enterprise Linux release 9.5
Description:

The SQL for testing the demo is as follows:
postgres=# create database test1;
CREATE DATABASE
postgres=# \c test1
You are now connected to database "test1" as user "postgres".
test1=# create schema test;
CREATE SCHEMA
test1=# create table test.t1 (id int);
CREATE TABLE
test1=# create view t1 as select * from t1;
ERROR:  relation "t1" does not exist
LINE 1: create view t1 as select * from t1;
                                        ^
test1=# create view t1 as select * from test.t1;
CREATE VIEW
test1=# create or replace view t1 as select * from t1;
CREATE VIEW
test1=# \d
        List of relations
 Schema | Name | Type |  Owner
--------+------+------+----------
 public | t1   | view | postgres
(1 row)

We know that in PostgreSQL (PG), it is not allowed to create tables and
views with the same name under the same schema in the database. When
creating a view for the first time (when the view does not exist), if the
table does not exist or has the same name as the view, the database will
throw an error as expected. However, as demonstrated in my test demo, when
the view already exists, running CREATE OR REPLACE VIEW does not check
whether the table exists. Although I understand that this might be an issue
with operational practices, as everyone knows, in a production environment,
our application development team might unintentionally or inadvertently
cause the same problem. The design might have been intended for quick
response without checking if the table exists, but rather modifying the
system table (my guess). If such an issue exists, should it be considered a
bug？