No sir, I am not mistaken. The Ld Missions and NB Missions follow the same expiration-reactivation process. You can see this very clearly by going to the Expired Missions tab.
You can buy with credits ANY expired mission, but the rewards for missions unlocked in this way will always be 10 clintz per MP of the mission. No matter what the mission's original reward is gone for good. You cannot gain LDs through expired missions. This system was put in place purely for the competitive mission points crowd.
The expiration dates on missions are only a time-limit for unlocking them. Once unlocked you can take as much time as you want to complete it and get it's normal reward.
However, what makes LD special from NB is that LD missions must be completed in sequence. Each one unlocks the next, so you must complete all but the last within the time-limit; this will unlock the last mission which when completed will give you the Ld.
There are also normal missions for that requires the use of each LD card, but that will never expire.
So as an example, let's say you spend credits to reactivate the mission "Gratuitous Violence" (200 damage with GHEIST
). For completing it, you would only earn 250 clintz and 25 MP. You would NOT earn Jaxx Ld
or 10 credits because those rewards expired.