Yeah, dedupe is exceptionally easy to confuse on images with a lot of transparency and mostly B/W or greyscale colour since one of its primary comparison vectors is colour intensity. Anyway, false positives happen but you shouldn’t worry about it.
Our perceptual deduplication algorithm is pretty good but it’s not infallible. I’m collecting cases like this behind the scenes to figure out improvements.
I ed a safe sketch and received a scat picture in return.