I'm having an almost identical issue. For me it crashes for me within a seconds or so of actually loading back to Stormfall before I can turn in my quest.

So far today It has done it on at least 75% of my missions. I'm wasting loads of my life having to reload the game and restart missions to try and earn my productivity points etc.This is making progress really painfully slow.

Why does the game lose all the progress you have made upon a crash?
Surely this data should be held on the Wolcen servers. Why can it not remember I completed a mission and allow me to turn it in upon reloading after a crash?
or
Automatically receive the rewards upon completion.

Never crashed in this game untill last night and today, approx 15 times so far.
Most of mine have been mid fight, game just crashes usually on 3/3 expedition runs, annoying

so i found this on reddit:
https://www.reddit.com/r/Wolcen/comments/faj8yl/solar_fall_was_causing_my_game_to_crash/

Solarfall is part of my spell set, so maybe the cause, come on devs, sort it

Same issue ! Every single time when i get out from an expedition or any missions the game crash... Never had the problem before the last update. Please fix it,

i'm having this very same problem