Steps to reproduce the issue

Upgraded automatically to Joomla 3.8.5
Discovered upgrades and updated database
Cleared cache and made all Joomla components active

Expected result

Admin menu for components should not have changed. Under Menu Item Type the option "Contacts" ist not displayed anymore.

Actual result

When I go into my "main menu" where there was a link to a single contact - The menu type was empty and the link leads to a 404 page.

When I choose menu type, contacts is not available anymore or seems to have disappeared.

This was the original page: http://webcache.googleusercontent.com/search?q=cache:oC2I9Uhjxe8J:www.kwg-zucht.ch/index.php/home/kontakt+&cd=2&hl=de&ct=clnk&gl=li

New: An error 404, page not found is shown.

System information (as much as possible)

 
PHP erstellt für | Linux hos110.unaxus.net 2.6.32-896.16.1.lve1.4.51.el6.x86_64 #1 SMP Wed Jan 17 13:19:23 EST 2018 x86_64
Datenbankversion | 5.6.38
Datenbankzeichensatz | latin1_swedish_ci
Datenbankverbindungszeichensatz | utf8mb4_general_ci
PHP-Version | 5.6.33
Webserver | Apache
PHP-Interface für den Webserver | cgi-fcgi
Joomla!-Version | Joomla! 3.8.5 Stable [ Amani ] 6-February-2018 15:00 GMT
Joomla!-Plattform-Version | Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
Browsererkennung | Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36

Additional comments

Tried to follow these steps, but couldn't find a solution :-( #15719

The alias for my main menu is "mainmenu" not "main" if that makes a difference (German interface)

Can anyone help me? Thanks in advance!!!