The news is on Galnet is "Any pilots who operate for one of the powers must deliver their cargo or vouchers before this time to ensure their activities are registered". This is a) hidden in what I considered the "fluff" section of the game and b) not very clear. Registered does not mean it is lost- when you dont know how this is handled in game you can easily assume that it simply doesnt count this time. But you could still turn it in and then it would count next cycle. It does not state you lose it. Poorly done.
Whilst I agree that it could be clearer i.e. unspent undermine vouchers will be lost, I disagree with the rest. Part of the point of using Galnet to convey information to the playerbase is to make the game more immersive, rather than just have all the content spoon-fed to the players as per X-box combat-sim 101.
The entire idea is that once you are in the cockpit, the info you need is there, in game. I realise that it might not always work 100% in practise, but I'd encourage FD to use Galnet for sharing info with the players in an "in-game" a way as possible, rather than breaking the forth wall continually. That might make things a little more oblique for some, but for many more it will make for an all round more rewarding experience.