The slaver quest when going into a bandit fort doesn't trigger, so I am unable to locate Cali in 09.b version.

In 09.a the new location was triggered as soon as I entered a fort, but it doesn't work in the latest version. I went through several bandit fort dungeons in case of the location was actually hidden in the dungeon but still nothing. 

 I tried starting a new game and going modded or unmodded, but doesn't change anything

I had the same issue and was talking to the dev, apparently it's a 10% spawn chance  per dungeon which will be fixed in the next patch. for now try setting the spawn chance in the variable.gd file to 1. the field you're looking to change is dungeon_unique_encounter_chance