Ok, latest nightly solves the issue #7341 that upgradable CbSubs plans are not proposed to blocked users which don't have the Registered group (or more precisely the default group getting assigned at registration, a Joomla setting) and don't have any group that is controlled by a CBSubs plan to which the user could upgrade.
So, in your case, with users having now Registered group and when expiring or expired, they will now see plans to re-subscribe to (Renew or Upgrade).