I have just noticed this green cast too among other Prores problems. (M1 Mac Studio, AE 23.1.0)
Rendering an original Prores 4444 file as a Prores 4444 introduces green cast to dark noise. Using colour management. Should be 100% transparent, but see the image below. Left is the original, right same file exported from AE:
Saturation increased to show the difference.
Yet another nail into the coffin. Adobe, Prores seem to be really broken.