Each time i have to defend my settlement against synthetic from institute, i kill everybody, i found a body with a synth component (i fire a shot in his head to prevent reanimation), i am thanked by settlers, but when i fast travel to another place, i get :

You failed to defend "X" settlement ... and when i return my turret, generators are broken...

I tried with Dogmeat : Search enemies, have a look on synth bodies then search ennemies, but nothing, Dogmeat don't found any enemie...

So please Bethesda, you created a very good game, but fix those bugs (there are a lot) because this is very frustrating...