updated version 25 to 26 default wallpapers disappeared

edit

hello, I updated fedora(gnome) 25 to 26 version and my previous default wallpapers gone and were replaced by new (it display solid white background instead of used previously).

https://fedoraproject.org/wiki/F25_Ar... - I expected them here but missing. Also I tried google it but can't find it I know it is cosmetic issue but I really like it(theme:nature, desert, asphalt road, clear sky).