Probably an interaction with A Better Advent WOTC but with your mod sends zero enemies into the new Avenger Defense from the Chosen (Assassin in this case). Removing your mod went back to a bunch of foes. Guess I should've disabled this after getting the new ABA and its own MissionDefs. Still testing if this resolves the mission becomming unwinnable despite me blowing everything to smithereens... But presumably it will.

I'd ABA has new MissionDefs than yes this mod will not work with ABA. If ABA just changed the types of enemies that could show up in missions, it would work fine but if ABA has messed with the mission types themselves than here will be an issue. Sorry, nothing I can do to fix that. Not a bug, just a mod conflict.

Hello Shadow79

As I said in the comment section,
I'm still getting the bug.....

I don't know if it can help, but in case you can take a look into this bug ?
Here the log file:
https://pastebin.com/uDeuqz0Z

Looking at it, I thought I may have the bug later on, as it points out some error ? and I did...

I uploaded a save game with only your mod enabled from a fresh start that keeps bugging for me as descripted by Natural Causes

https://wetransfer.com/downloads/ad5fa4b1b6db0da662d832470d4c303520170916131432/cb93891cb37a6b34befbf505601c220f20170916131432/cfa681

Anyway thanks again and hope you will have good news for me one day to get this working lol :-)