While working on MDL-24120 I noticed that there was a bug in navigation logic that as well removed the "return to XXX user" link. Even though this link should not have appeared for another reasons, this bug prevented local plugins from adding individual items to the settings menu.

Even though it's a bug I would not recommend backport it

The commit also removes the unreachable "return to XXX user" link that was supposed to be removed as part of MDL-23911