Even though update 22 was installed, the previous update version is displayed on the Home page of the Provider panel.
Such behaviour was considered as a software issue with id #PPA-3123.
Clean update cache on the management node:
# rm -rf /var/cache/ppa/updates/PPA_11.5.0/UPDATE_latest/
Re-run update procedure:
# /usr/local/ppa/bin/ppa_update --install-updates