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Chromakey replacement in LiveAvatar

Hi there.

We're trying to do some background replacement using green-screened avatars, but we're seeing a lot of aberrations around the edges - either too much is removed via keying (especially in hair and the edges of clothes) or there's a green outline around the avatar. We've tried following the demonstrations here: https://hgapitools.vercel.app/ to no avail. Is there something we're missing, or a better way to do the background replacement?
We were using the information here https://docs.heygen.com/docs/adding-chroma-key-to-streaming-demo and after asking support about it, they pointed us to this link https://github.com/HeyGen-Official/StreamingAvatarTSDemo (which is deprecated?) and then to ask the question in here.