Default Nexus 5 mountain wallpaper defect!

Generally I keep my Nexus on 10% brightness, but recently after playing a video (Adore You - Miley) at some extended brightness ; I came on the homescreen and saw some white spots on screen (see across the Google search bar, near peak of the mountains in the attached picture ). My Nexus fell on the floor by face some days ago and I thought it had created dead pixels but no. I changed the wallpaper and it's gone, plus I think it's been captured in the screenshot So is this a defective wallpaper? And Google didn't notice!

Nexus 5 - My Beloved Beast