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From what I've found people's best idea is that this happens with clip studio and some other select program because they handle antialiased/semitransparent pixels differently, making them read as white instead of black in certain programs such as PNGTuber Plus and often discord.

The weirdest thing here is the fix - open each individual art file you use to piece together the model in Microsoft Paint (it's weird, I know), hit Ctrl s to save, and close paint. You've fixed it! It's how I've been fixing all of the models I rig and it's been working a treat, even if it is boring and repetitive.

I did a lot of testing in exporting in different formats (PNG, JPEG, PSD, etc) and ways - I think it's exporting at all through Clip Studio that adds that weird white pixelation, and from there it can get a little confusing on how to fix it since I don't recall if it's fixed by re-exporting in Krita. For some reason, Paint works? At this point, because a lot of my art friends use Clip, I just open the png file in Paint, hit ctrl s, and then close paint to get rid of the border on every piece one by one. If you find an easier way to do it let me know!

Hi, I've actually been working to figure this out and fix it a little! Turns out the source of it for me personally is the way that Clip Studio exports PNG files - something about converting transparent pixels to white, instead of black like most other art programs. This is fine for some stuff that accounts for both, but Discord and apparently Godot don't account for the white transparent pixels, so you get that weird white pixelation. What I've done to fix it is exporting pngs in a different art program, or if I already exported via Clip Studio, you can literally open the PNG in PAINT of all things, hit save, and it's fixed! I hope this helps!