To understand the content, you must understand the creator. "Avva Ballerina BG" operates primarily out of Bulgaria (the BG in her handle), a country with a rich history in rhythmic gymnastics and classical ballet. Unlike many "pretend" influencers who buy pointe shoes for a single photo shoot, Avva’s content suggests years of rigorous training.
There is no widespread reporting of a specific "green screen error" unique to Avva Ballerina's OnlyFans. If you are looking for a specific video that was previously "broken" or had a green background issue, it is likely the creator would need to re-upload a corrected edit with better chroma key settings.
: Removing the green light reflecting off the subject (the "green spill"). Matte Correction