Apple photos preview bug

So this occurs only when I edit in the default editor. Google photos editor or any other fixes the problem. When I contacted apple support they said they needed my phone for observation and it might take a week or so. Even the apple service centre guys had no idea. SO MUCH FOR THE APPLE EXPERIENCE!

The grey or coloured lines are only in the small thumbnail preview when I actually view the photo it seems to be fine. I did what you asked and downloaded the file to my PC it works fine as well. Although the lines are showing up in my cloud preview as well. Most of the lines are in images which I edited with the default photo editor if that helps in finding a solution.

Adding or reverting the adjustments doesn't solve the problem. Rotating or zooming in fixes it for just a while and goes back to being corrupt as soon I reopen the app or I scroll to another pic. It seems the default editor is causing the problem. I edited a few pictures with lines in Snapseed and saved and the lines disappeared.