How can a buyer mark your gig complete without a review?

I don't know if this is a new Fiverr feature, but I received 2 notifications where my buyers marked the order complete, but did not leave a review.

This seems either like a new thing since usually a buyer will leave a review and mark it complete automatically.

Yes, I know that the buyer can press the thumbs up button, but that never happened either.

Is this happening to anyone else?