I have a very similar issue. Working on battery resolves. Flashed the BIOS, updated all drivers.
There are flashing gray and green lines through the camera image. On battery it looks fine. I don't have an image takeover blinking like
ricardobrandaop, it's just green and gray lines.
Infuriating, as I need a webcam for daily standups and whiteboarding, especially during the pandemic.
Zenbook UX391f