Steps to reproduce the issue

Try to install a component with a submenu, like this:

... <administration>
    <menu img="class:bill">com_bill</menu>
    <submenu>
        <menu link="option=com_bill&amp;view=users" view="users" img="class:users" alt="Bill/Users">com_bill_users</menu>
        </submenu>
</administration> ...

Expected result

Bill Menu with Users submenu

Actual result

Bill menu without a Users submenu

System information (as much as possible)

Joomla menu table

Additional comments

Also the menu item in database don't have a parent menu and component id.

The component installer install successfully in joomla 3.4.8

Download demo bill component