Unable to create a database issue

I have run into a serious bug since recently upgrading my 3 servers to WHM 56. The issue affects any cPanel account that was created with a username longer than the traditional 8 characters and results in the following occurring:

1) When trying to use Installatron to install an application, the installation fails with the following error (example only):

Error
Unable to create a database. Check that your hosting account has at least one database available. If it does, please contact your host.

Technical Error: The database “xxxxxxxxxxxxxx_afmo1” already exists.
`xxxxxxxx_afmo1'

2) If then try to manually install the application; the creation of a database works just fine, but when I then try to run the application's installation process, it complains that it cannot connect to the database even though all details are entered correctly.

I have tested the process across 3 servers, all running WHM 56 (Build 14) and MariaDB 10.0.25, with the same results. I have also tested installing different applications, again with the same result.

Accounts that were created with the traditional 8 character limit are unaffected as their cPanel and MySQL/MariaDB usernames match up.

Any advice on a fix for this?

 

Thanks for the reply Michael, however, the issue is not specific to Installatron as it also occurred when attempting a manual installation completely independent of Installatron.

After looking at the documentation, the only way around this I believe is to disable the inclusion of the username prefix for new databases. However, on a shared server this is not ideal as the username at the front makes it much easier to manage a large number of databases across many users.

The problem only exists for accounts that are manually created via WHM, as this defaults to the newer naming protocol that allows usernames up to 16 characters. So this is mostly affecting resellers that are still using the WHM account creation process.

Is there a way to force cPanel to only create users with the previous 8 character limit?