As it says, don't try it! Lol
(You can fix with a factory reset apparently.)
Interesting bug though. Fix out on the 11th I believe.
https://www.bbc.co.uk/news/technology-52891650
It's also possible to deliberately create images that have more colour information than some devices can handle.
My phone's a racist?
The issue is fairly simple, Android displays images using the sRGB colour space, whereas that photo is in a regular RGB colour space, but the issue only seems to affect certain devices:
https://wccftech.com/setting-this-picture-as-a-wallpaper-soft-bricks-your-android-phone-dont-do-it/
https://www.techspot.com/news/85442-setting-image-wallpaper-bricks-android-phones.html
It does seem pretty stupid that Android can’t handle an image colour space that’s been a standard for images used for colour displays since colour tv was introduced.
What you get when anyone can set their own standard for the OS, I guess.
My tech nerd 16 year old just tried this on his phone. Moto G7 with a custom ROM. It went into a fit of turning the screen on and off. He's now in the recovery ROM sorting it 😆