Google Pixel Owners are reportedly seeing image bugs in screenshots sent from iPhones. The Problem occurs when one sends a screenshot from iPhone to a Pixel or other devices running Android 7.1 Nougat.
According to a discussion on Google's product forum, Pixel users claims that it (The bug) only happens with a screenshot from iPhone 7 Plus. The screenshots from older iPhones i.e. (6 and older) works fine.
Apart from Pixel/Pixel XL, a Nexus 6 user running Android 7.1 has also reported the same issue.
Google support staff is now aware of this issue, but there's no indication when the same will be fixed.
Via:- Android Police | Source:- Google Product Forum