Please check a strange behaviour when Editing already existing Fresh*** Custom Link.

***Fresh means a link created in the same window session (without any refreshing) just a seconds ago

Case scenario:

Go to the #Manage > Settings > Menu Settings (/portal/admin/settings/menu-settings) > Add any link to the Sidebar Bottom Link Group and Save it. Then again click the Edit Button for that fresh link in the Sidebar Bottom Link Groups > dont change anything but just click the Save button.

As a result you will see duplicated entry in the links table (on a left pane there will be only single entry visible). When you refresh the page (F5) it wont be visible anymore.