Some unwanted artifacts

Hello ! After updating Photoshop CC 2017.1 I had such problem. I was making some visual at work. In the project there is some Vactor Smart Object layers. After saving my picture as png I saw that there some strange object appeared. I was thinking that maybe there is something wrong with VSO layers, so I opened them in Ai and there were no redundant objects on it. I've tryed to reopen project, to close photoshop. Nothing helped. I have same issue long time ago, but project was too comlex, but here's nothing special. Have any idea, what can it be ? I work in Photoshop on Mac OS.