stuck - EoS "defeating the kett" quest

Definitely bugged. see also bug report: "Kett Base on EoS cannot enter Zenith Observation Room. Additional problems.

After a several waves of invisible Kett with infinite spawns. While I finally finished (Kett sure repaired those front guns fast), hopped into the Nomad, drove off into the sunset and it won't let me fast travel - "in battle" it says, even though I'm kilometers away from the generator - and of course, IT WON'T LET ME SAVE YET... WHAT A POOR DESIGN DECISION... I've already had several corrupt autosave files that go on infinite load and I have go to a previous file.

At times, the game doesn't provide proper locations of where to go for the next stages - ran around lost quite a few times with no clue as to where the next stage should be.

EDIT: So I went back to the generator - fully populated (again), front guns repaired (again) - don't know how many time you have to kill these before the game lets go. Will do one more round of it and give up - wished I knew it was such a severe problem and will skip it on my next character. Still can't save, fast travel. What an annoyance...

EDIT: Killed them all. Still can't fast travel or SAVE. I used T to go off planet. When I checked the missions, "Defeating the Kett" was completed, thankfully, but I never really got that impression. Still a place I won't visit again until I know for certain it's been patched.