Chroma scaling on the 3-phase processing is more or less the same compared with the old version.
With 2-phase the implementation is quite different, but the results are very close.
I like to mention that reducing the number of TAPS also influences chroma scaling, it’s very straightforward with 2-phase. With 16 TAPS chroma spread is 2x smaller compared with default 32 TAPS, for example.
Reducing number of TAPS can have it’s benefits, for example notable speedups with certain situations/resolutions, a more clear image, especially 2-phase etc.
You can also use default values, it’s the same thing with old and new versions.