Daffodils grow in dappled lighting, at least where I am (6a, on the border of 5b). There are pockets of them in the woods in my backyard. I think Mother Nature planted them, because it seems like unlikely spots for humans to want to go out with a shovel or bulb planting tool.
Actually I have a cluster of very old fashioned daffodils growing out in the middle of my back yard. There was the wreck of a small shed in that area, so I suspect they were planted by that shed when it was new and good. Perhaps that is why you have some of these where they don’t belong now. This was almost 45 years ago when we bought the house. The wreck of the shed is long gone.
Where the cluster of trees and brush are that I am having cleaned up, there once was a pony shed. I found some old horse gear there over 20 years ago, but I can no longer spot any remnant of that pony shed now.