I've got this issue where I have a teal background and a fuchsia foreground, and when exporting, the anti-aliasing between the two leaves a dark transition. I've found a few workarounds, one of which is exporting upscaled without anti-aliasing and downscaling it in Photoshop with a ProPhoto RGB color profile, the other of which is using ProPhoto RGB color profile in Illustrator, and using "Save for Web" to export it, which seems to yield better results.
Is there a name for this phenomenon? Is there a good solution other than multi-step exports or using a legacy export option?
Images of desirable and undesirable blending respectively: