I've just noticed this. I loaded a game started in DWU 1.9.5.0 with the just patched 1.9.5.1. Upon resuming the game, a new destroyer has been finished. It went on auto + Engage Nearby Targets. Then I noticed it had a Capture mission:

He is trying to capture an independent civilian ship, as a pirate would do. The thing is, I am playing as Humans. I don't know if it's normal, nor if it was the case with 1.9.5.0 already, but I never noticed anything like this before.