Solved [K.5.0] Bug: Cannot Add Custom Module Position "kunena_top"

#### Steps to reproduce the issue
1. Create a new module (Any Type)
2. Set Position to: kunena_topic_2 and save the module
3. Now edit the module an try to change the position to: kunena_top



#### Expected result
You should be able to add any custom module position.



#### Actual result
There is a conflict with the position name, Joomla won't let you add a new custom position if there is another with the same word at the beginning.



#### System information (as much as possible)
K.5.0+Crypsis
J.3.6.2+Protostar
PHP 7.0.9
Chrome 52.0.2743.116 m



#### Additional comments
Priority: Low-Medium
Comments: This bug can be fixed in Joomla or Kunena.

You need to press enter after typing kunena_top

Trust me my friend, it doesn't work.
When you press enter, It always takes the first suggestion.
I tried that option hundreds of times before bringing the bug here.

is your right, please add a new issue on github.com/joomla/joomla-cms/issues

Done.
issues.joomla.org/tracker/joomla-cms/11522

Please, Let's keep this topic on hold until I receive an answer

That's not a bug. If you have parked the mouse in the list, it selects this entry if you click on enter.