A while back the old problem of production buffs not sticking/ending too early was merged with the newer zone buffs ending early problem. This seemed, even at the time, like a too hasty mistake. Fingers crossed it's clear now that the fix for the zone buff issue did not fix the regular production buffs issue.
If it's possible to check it would be worth making sure the vanished production buffs haven't reappeared in the buffer's star menu, when it's a quick-fail that often happens. Might also send a nudge ticket to support, if they don't hear anything directly for a while it's not unusual for things to be filed under 'No-one has said anything in [time], so it must be fixed.' or 'Oh, you're the only one who's had a problem.''
In sum ~ I know that's not terribly helpful, but it seems to be the current state of affairs until proper news rolls in.