I've seen reports pop up that if you've been to Anchorpoint before the Terran Armada DLC directs you to go there, the second Terran Armada mission "Into the VOID" fails to start, locking you out of the questline and, by extension, the main meat and most of the side content of the DLC. This appears to happen regardless of whether Terran Armada was installed at the time Anchorpoint was discovered. (I hope I didn't overstate the severity of this, since the mission does trigger correctly if you've never been to Anchorpoint, but the fact that you can break the questline just by freely exploring feels like an all-caps MAJOR issue to me)