I think i found another bug.
Today i was commissioned by
special mission (i had only patrols before).
When i sunk my first ship and i check captains log, i experienced CTD.
Next time (well for third when i realizes somethings wrong with my mission) i saved game just after sink it again (i started new patrol and i had the same objective) and just after ensuring there is NOTHING anywhere around i saved it, exit to win, restart game and load simply does not work (after meme loading screen just black screen).