I am playing this mission. I make it to the nav point as required, destroy multiple waves of ships, and clear the nav point of all enemies. The mission text shows complete. My next landing for fuel, the mission disappears. I return to The Informant, and he tells me I haven't finished the mission yet. Anybody else have this problem? Any solutions?

Last mission in Eden system requires to fly to hidden nav point (not visible on NavMap). Big hint was in text of some NPC. In short: fly to the Moon. It's not real object but picture in background. Just "aim" it and fly there until you'll meet your destiny.

Here's guide:
https://gamefaqs.gamespot.com/pc/564586-wing-commander-privateer/faqs/15468

But there is mistake (in above guide). In Valhalla system you must find hidden jump point to hidden Eden system. There land on planet (secret Retro base) and talk with NPC.