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- have a image with color data and mask
- export it to png (whatever method. saving/quick exporting, all of them have this same issue)
- open png and display RGB only data (no alpha), (also could be done through photoshop, import png, layers>layer mask> from transparency)
There's an ugly white frame around my image where fully transparent pixels were. I know these are fully transparent but people might use alpha channel to store some other data (like roughness) and this antifeature ruins color data. Also it's gonna ruin mipmaps
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This would be helpful if posted in the Bug portion of the forum. Then people can "upvote" it, to get the attention of the developers:
https://community.adobe.com/t5/photoshop-ecosystem/ct-p/ct-photoshop?page=1&sort=latest_replies&filt...
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Bug or not, until it gets fixed you might consider using a third party plugin called SuperPNG that was developed because of bugs in the way Photoshop handles png files.