This has been driving me crazy too. But I found that an app called Folder Organizer (and presumably its sister app App Organizer too) can remedy this problem.
Folder Organizer will see all apps whether or not they appear in the drawer. You just attach a label to Voice Recorder (or whichever app you can't find in the drawer), then long press on a home screen and choose the 1 x 1 FA widget. Scroll down the pop up screen that appears and select Voice Recorder. It will show up like it used to.