Again, my suspicion is that you are actually seeing the ICC profile being applied correctly, and it is the pixel values in your image that are incorrect.

A good test would be to run a single 100% sRGB red pixel through your image processing pipeline, and then inspecting the resulting PNG file in a hex editor to see what value is encoded.

You can also visit this web page to actively test each web browser’s respect for embedded ICC profiles: https://www.gballard.net/psd/go_live_page_profile/embeddedJP...