There are several unknown pictures were added to my iPhone Photos. I'm developing a iOS app in swiftUI. And I'm sure that neither my developing app asked a permission to save photos to iOS device, nor these pictures are taken by myself, downloaded from the web, or synced from my iCloud. Why does this happen? Is my account or my iPhone attacked or hacked? btw, my device has turned the debug mode on, will this setting option would leads some vulnerability or some debug tools would add photos to my albums?
The attached pictures are the unknown photos in my Photos App. I'v search this photo with google. And I found that many developers in stack overflow use this picture when they encounter troubles with image display or other manipulation. Where where are this photo come from? Why does it exist in my Photo albums?