Ah. My bad, after restarting OpenHAB the versions changed to M6. And if I clean the cache now, everything comes back online nicely. Thanks a lot!
For the recap:
sudo openhab-cli backup --full # just in case
sudo systemctl stop openhab2.service
sudo apt-get install --reinstall openhab2
sudo openhab-cli clean-cache
sudo systemctl start openhab2.service