FWIW, I had Nano Banana create pure white/black images in February, and there was no recognizable watermark in them (all pixels really were #ffffff / #000000 IIRC).

Meta: your comment was marked [dead], like a few other constructive comments I saw in recent days. Not sure why.

I suspect they strip the SynthID for these specific cases to prevent exfiltration of the steganography.

I appreciate you pointing it out, but this account is banned. Thank you for vouching though!