Still happening and its 2025. My guess is its a multiple monitor issue, but who knows? Doesnt seem like Adobe knows either since its been 7 years at least.

Yeah, that’ll take some work to get it right. Not an easy key with all that spill. I think you’re going to have to spend a few hours and just brute force roto those feet. I’d suggest doing it in mocha if you know how. And maybe do a luma key for the shadow if Keylight isnt working.

Probably not the case, but you don’t have a layer style on the problematic layers, do you?

Have you tried exporting to prores 422hq or something with less compression, and then export that to h264?

My first guess is that your source imagery was created with dark edges somehow. Try masking the image so the edges are cropped a little and see what happens.