I have to document this here, because I think it is a serious glitch that the devs might want/need to look into, though I doubt it is a repeatable bug.
1) The mission described above was in the system 15 Lambda Aurigae. Mission Giver was Serena Parsons/Digger Invictus. Turn-in @ Fischer Port in LP 128-9. I tried twice to scan the private Data Point, which did go Inactive as mentioned above, but the mission would not complete. I put it aside and moved on.
2) I took on two more Planetary Scan missions just in the last couple hours. The first was in LFT 424 and was labeled a Civil War Surface Installation scan. Mission Giver Amalie Anderson/Liberals of LP 128-9. Turn in @ Fischer Port, LP 128-9. This was a Public Data Point and the scan was successful, I got the mission completed/Collect Reward message.
3) The second of the two recent P-Scan missions (Planetary Scan Job) was to G 175-42. I picked it up in Athra. Mission Giver Jaylynn Holden, LP 128-9 Group. Turn-in @ Irwin Port in Athra. I found the planet as usual (Discovery Scanner), found and chased the Search Zone, landed, deployed the SRV, scanned the Public Data Point. And here is where it gets really ' weird. When the Data Point went Inactive (done with scan), I received a mission complete/Collect Reward message -- but it was for the first mission on 15 Lambda Aurigae! The mission for the planet I was actually scanning on did not complete -- deja vu all over again.
I decided to go to LP 128-9 to confirm I'd actually finished the first two of these missions and sure enough, there's now the expected payoffs, both for the original glitched scan and the second listed above in this post, which went off completely normally.
I will return to the G 175-42 site and try it again and report any outcome. Of course this particular job has the 1 mil + payout, so it's the one that had to go flooey, right?
Is there a particular way I can bring this thread to the attention of the right folks for investigation?
EDIT: The G 175-42 mission went A-OK second time around, putting my daily wage at around 4.8 mil -- I guess that was worth a little extra effort.