BUG #17111: Database created, cannot be created, but reported as inexist

The following bug has been logged on the website:

Bug reference:      17111
Logged by:          Bernaridho Hutabarat
Email address:      bernaridho@outlook.co.id
PostgreSQL version: 12.7
Operating system:   CentOS
Description:

postgres=# \c Database
FATAL:  database "Database" does not exist
Previous connection kept
postgres=# CREATE DATABASE Database;
ERROR:  database "database" already exists
postgres=# DROP DATABASE Database;
DROP DATABASE
postgres=# CREATE DATABASE Database OWNER ServiceUser1;
CREATE DATABASE
postgres=# \c Database;
FATAL:  database "Database" does not exist
Previous connection kept
postgres=# DROP DATABASE Database; 
DROP DATABASE
postgres=# CREATE DATABASE Database OWNER postgres;
CREATE DATABASE
postgres=# \c Database;
FATAL:  database "Database" does not exist
Previous connection kept
postgres=# DROP DATABASE Database;
DROP DATABASE
postgres=# \q