BUG #16131: pg_upgrade 9 -> 11.6 and a database is missing

The following bug has been logged on the website:

Bug reference: 16131
Logged by: Jed Walker
Email address: jedwa(at)comcast(dot)net
PostgreSQL version: 11.6
Operating system: CentOS Linux release 7.7.1908 (Core)
Description:

I did an upgrade of two matching servers, one from 9.2 -> 11.5 and had no
problems, but yesterday I did the other 9.2 -> 11.6 and a database and user
were missing from the upgraded database.

I saw no errors, other than the unix_socket_directories issue, but one of
our databases is not in the new 11 server. We had a similar system with the
same databases that I upgraded a week ago and all databases came across.
There is no reference to this database in the upgrade logs.
The key difference between the system that I did previously that worked and
this is that the one that worked was 9.2 -> 11.5, and this was 9.2 -> 11.6

Upgrade process:
yum install -y
https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
yum install -y postgresql11
yum install -y postgresql11-server
shutdown -r now
systemctl stop postgresql
/usr/pgsql-11/bin/postgresql-11-setup initdb
/usr/pgsql-11/bin/pg_upgrade -v -r -d /var/lib/pgsql/data -D
/var/lib/pgsql/11/data -b "/usr/bin" -B "/usr/pgsql-11/bin"
systemctl disable postgresql
systemctl enable postgresql-11
systemctl start postgresql-11
~/analyze_new_cluster.sh

These are the databases, after upgrade database wasp and user wasp_user were
missing.
postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access
privileges
-----------+-----------+----------+-------------+-------------+-------------------------
nasdb | nasuser | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres
+
| | | | |
postgres=CTc/postgres
template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
postgres=CTc/postgres +
| | | | |
=c/postgres
wasp | wasp_user | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
=Tc/wasp_user +
| | | | |
wasp_user=CTc/wasp_user

The users are using the system, but I'd be happy to send logs etc.