....and then there's 'this', dazzlenation....see previous posts....go figure:

https://www.reddit.com/r/AfterEffects/comments/11on4ir/black_outline_around_snow_green_screen_after/?onetap_auto=true

Ghirlandaio,_Domenico_-_Calling_of_the_Apostles_-_1481.jpg (1359×818) (wikimedia.org)