I've experienced the same thing. These missions are a total joke. They used to be fun when you could expect a decent amount of targets to spawn in SC but now all you see are the Mission USS with crappy targets.
I used to stack a wing mission with 2 or 3 singles and it would cause the targets to spawn at a higher rate. As the Wing mission had a time of several days I could do this over a few days stacking singles until the wing mission completed. That is all borked up now. I never see any missions targets in SC, at least thet is my experience lately.
I don't know what the deal is here. It seems Fdev have this distain for engaging NPC combat. CZ are a waste of time IMO. I've said it before, war is faught like it is 1850, let's meet on the battle field and slug it out. But that is a whole 'nother thread!
Bounty Hunting is MEH and barely profitable.
It is like they are pushing everyone to be miners, haulers and explorers.
Seems the PVPers are the only ones finding engaging combat.
It seems to be a symptom of this game. Of all the missions offered I do maybe 1/3 because the rest are just stupid or a waste of time or what seems to me an effort to sucker me into getting a bounty. Again whole 'nother thread.
But I'm rambling, FDEV, I asked to have these fixed before because they used to be one of my favorite missions. If this is your idea of a fix, well, you failed misserably. (not that your even listening)
And I still love the game, warts and all!