I wonder why editing any image with Photoshop-like tools is considered an AI augmentation/created? Image editing using tools has been around for many years, but people are skipping it and using different GenAI models to manipulate images much faster and more easily; these provide a completely different set of results. I would say that you were using the wrong detectors for this exercise.
Google's SynthID (which is built specifically for Google-generated images) seems to work even for the final edit. Try sending it to Gemini with the query "Is this image ai generated?"
See here for more info: blog[dot]google/innovation-and-ai/products/ai-image-verification-gemini-app/
Can software save us from deepfakes? We put six detection tools to the test with a 'Nano Banana Pro' image. The results show that current tech is easily outsmarted. Simple edits using standard software were enough to drop detection rates to almost zero.