At first, the only mission in the spotlight was my own, but I was finally able to play another players spotlight and it rewarded me 1440 dilithium, but not dilithium for the time played, or the EC that was supposed to be along with it.
non spotlights seem to be rewarding as intended based on my experience so far.
I just added this to the known issues section of today's patch notes:
At this time, only the current Foundry spotlight mission grants the bonus EC and Dilithium. A future patch will resolve this so that past spotlights in the "spotlighted missions" tab also qualify for the special spotlight bonus.