Probably not a bug. Was reported several times on PTS.
If Im not mistaken it's attempting to keep Storymode nice and casual but in return also keeping the rewards light. It's also likely to make sure people keep using the Group Finder to farm BH comms as well as making sure nobody can gather BH comms too quickly. No proof to support this, just an educated guess.
This guy got it right. BW didn't put it in the patch notes because they knew people would complain. It was supposed to raise people queuing in group finder to get their black hole comms there (think about it. you can get 10 comms a day by running an op and a hm flashpoint. WAY faster than a SM EC run). Ironically, the group finder pops have gone down on average. Sometimes I'll have a lucky day, but most times not.