BUG #15870: You can't see the table after executing the table-building statement with \i

The following bug has been logged on the website:

Bug reference: 15870
Logged by: 强 魏
Email address: 1726002692(at)qq(dot)com
PostgreSQL version: 12beta2
Operating system: CentOS Linux release 7.6.1810 (Core) GCC-4.8.5
Description:

postgres(at)127(dot)0(dot)0(dot)1:5432[cmis_to_mysql]#\i
/home/postgres/aa/cmis_to_mysql.sql
SET
Time: 0.550 ms
SET
Time: 0.573 ms
SET
Time: 0.910 ms
SET
Time: 1.353 ms
SET
Time: 1.049 ms
+------------+
| set_config |
+------------+
| |
+------------+
(1 row)

Time: 2.336 ms
SET
Time: 0.298 ms
SET
Time: 0.256 ms
SET
Time: 0.203 ms
SET
Time: 0.273 ms
SET
Time: 0.184 ms
SET
Time: 0.387 ms
CREATE TABLE
Time: 56.455 ms
ALTER TABLE
Time: 3.026 ms
COMMENT
Time: 8.306 ms
COMMENT
Time: 2.670 ms
COMMENT
Time: 1.989 ms
COMMENT
Time: 3.834 ms
COMMENT
Time: 2.543 ms
COPY 12
Time: 4.449 ms
CREATE INDEX
Time: 8.782 ms
CREATE INDEX
Time: 4.601 ms
postgres(at)127(dot)0(dot)0(dot)1:5432[cmis_to_mysql]#\d
Did not find any relations.
postgres(at)127(dot)0(dot)0(dot)1:5432[cmis_to_mysql]#\c cmis_to_mysql
You are now connected to database "cmis_to_mysql" as user "postgres".
postgres(at)127(dot)0(dot)0(dot)1:5432[cmis_to_mysql]#\d
List of relations
+--------+---------------+-------+----------+
| Schema | Name | Type | Owner |
+--------+---------------+-------+----------+
| public | cmis_to_mysql | table | postgres |
+--------+---------------+-------+----------+
(1 row)