Same issue here. Upgraded from legacy version (exported form, deactivated plug-in, uninstalled, reinstalled latest from WP catalog), does not appear in dashboard. All plug-ins deactivated and caches cleared; still doesn’t appear.
Edit: I’ve found if I delete the .maintenance file and refresh the updates page (uncertain of negative effects), it’ll show it finished the update of one plugin/theme and move on to the next. Rinse and repeat for each item to be updated.