I was testing photos to use as my lockscreen. Now, in the "Wallpaper" settings, I see a whole bunch of old photos I don't need or want anymore clogging up the "Set as Current" feed - there's no option to delete these; deleting them from my Photos app doesn't delete them from this list.
iPhone 13 Pro
After you've deleted the photos from your Photo app, try restarting your iPhone afterwards. When you iPhone is switched on again, see if the images are still in the Set as Current feed.
They should disappear as you cannot select them again if they are deleted from your iPhone.
If you have a Lockscreen where the image has been used, try to delete it as well, and set up again if necessary, without the images you don't want to see.
Delete wallpaper history?
