I have been testing, and the problem appears to be the PNG8, because the same image saved as PNG-24 is working.
Your test image was ok, but with no trasparency.
So the problem is solved, PNG-24 working, but I have to do more tests, because there are some of the images without watermark,... and I think is because the browser's cache.
so I will tell you when I can test deeply,
Thanks,
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