Well, technically the bug was not shutting the masternodes down, it just caused masternodes to fail to vote on a watchdog object.
Dash 12.2 will not have watchdogs anymore, they are deprecated (quote from flare).
Although if people wait too long with implementing this hotfix, they could be forced out of the masternodes payment list and then need to start from
cold wallet again. Luckily most masternode owners responded very fast and implemented the hotfix within a few hours.