Expedition hardlock after killing the final uberboss The Aberration

Hi, I killed the final boss of Expedition (if you need proof, here it is), talked to everyone in the Expedition village, and... that's it. My expedition quest disappeared, I can't continue with the logbooks because they didn't give me one. And yet, Atlas interface says I only killed 4/5 bosses.

I've completed all "logbook location nodes", but I haven't found a single logbook to continue my voyage.
Did I really complete the Expedition? Please give me logbooks and the ability to continue expeditions.

Update: I crafted a unique quarterstaff Duality, although there was no quest for it, after that the game told me to "talk to Farrow", but he does not have any quest dialogue.

Bump, my "boss kill" counter has been updated to 5/5, but I'm still blocked from continuing the Expedition; no one has given me a logbook to continue my voyage.