I unlocked Lawless Frontier earlier through the quest and jumped into some Invasions. I completed (and won) three in a row, and now the entire Lawless Frontier activity has disappeared from the Director when I went to load into a fourth one. To clarify, the node labeled Lawless Frontier is still visible, but the actual activities—Lawless Frontier and Invasions—are gone. All I can see now are Tharsis Outpost and Fire and Ice. The yellow planet is completely barren, and there is no Invasion node above in the center. I have reset my game, and it did not reappear.