After live, when I would do sets of three exploration star cluster quests, I would get SP for each mission I did and SP for turning in the mission when the set of three were complete. After a recent patch (I think two patches ago) I no longer get SP for star cluster mission, only for the turn in.
I know I did not get any SP for the star cluster missions where you scan several items on planets or when you scan five anomalies. I am lvl 8, so after spending over an hour doing these missions, I got 52 SP at turn in and that is it. I remember before I would get 52 for each mission and the turn in for a total of 208 sp for the set. That is a major drop. I was under the impression that Exploration was one of the independent SP paths. PVP, Campaign PVE, and Exploration PVE. With this recent change, Exploration is now several times longer to advance.