Well, let's explain it this way: If you want to paint shades of gray, don't use feather and ink.
There are many reasons where "binary alpha" (either completely opaque or completely transparent) is required. But probably not for effect particles. Partial translucency would be suitable for them. Therefore, you should never convert from an original to a release image format without thinking and chosing the best matching options. Automatisms were the reason why we have so many ugly textures today (frayed fences, grass and trees; tree leaves becoming black blocks in fog) which I can't fix, which "only Talad" is able to change.