I'm running through the "Never Far from the Queen" quest on the "Go to the temple of Woedica" objective. In one room there's an Orlan hiding from the Knights. When I opened the door to transition into the room I noticed Aloth had disappeared from my party roster.
I created a new save and reloaded it. Didn't work. I loaded from a save I made in the beginning of the Catacombs and he's back in my party. Again, playing with the transition between the Catacombs and the Orlan fugitive room it appears that some of the time Aloth will disappear.
Oh well, no big loss. Only took 10 minutes to grind the catacombs, anyway. I'll load the old file and do it again.
Dropbox link to savegames, output log, system specs, and screenshots: https://www.dropbox.com/s/pzfgyjjsb2z171z/72861-aloth-goes-missing-from-party-in-copperlane-catacombs.zip?dl=0
The save with Act 2, 9 days, 8 hours is with Aloth still in my party. The save with Act 2, 9 days, 13 hours is after Aloth goes missing.
Thanks!
-AGB