It is not a bug it is by design
please see the documentation at https://docs.joomla.org

On 1 April 2016 at 17:59, vincent notifications@github.com wrote:

Steps to reproduce the issue

Custom HTML Module -> Advanced -> Module Class Suffix, fill in class name
like "myclass"
Expected result

the

's class should be "custom myclass"
Actual result

the

's class is "custommyclass"
System information (as much as possible)

Joomla 3.5
Additional comments

I think this bug has been there since 2.5

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#9700

Brian Teeman
Co-founder Joomla! and OpenSourceMatters Inc.
http://brian.teeman.net/

I think this creates confusion for beginners. I can still remember how I lost my hair over this issue several years ago. Wrote some style in .css and fill in the the class name but it just didn't work.