https://arstechnica.com/gadgets/2021/11/google-accidentally-pushes-android-12-to-pixel-users-a-second-time/

Sure, you probably have Android 12 on your Pixel phone by now, but what if you put it on there a second time?

That's basically what happened to a bunch of Pixel users yesterday. They had the latest Android 12 build on their device, and the phone's automatic update system prompted them to download nearly the same build through a whopping 1.8GB download. After questions on Reddit popped up, the official Google account responded to users, saying, "We're sorry for the alert you received. Not to worry, we've resolved this issue and you can disregard it."