Tech 6 is broken and will only be fixed in the 2.3.10 patch on the 27th. If your mission runs out before then, contact FD support with a "missing in-game items" ticket, they should be able to help. Alternatively, fly back to Meene, turn in the mission and get the 100M you have collected so far. Undock and redock to get the mission again. Collect the 100 achievable obelisks and once the fix is in, collect tech 6 and complete the mission a second time.
Dirty deeds done dirt cheap for reasonable prices