scripts state for float (32bit) chroma for now:-
aside from smaskmerge, in SMDegrain, Dither_Luma_Rebuild and SMDegrain_prefilters mode 3 both will give wrong output in chroma
but since mode 3 use Dfttest not work with float (32bit) yet this is not a big problem, Dither_Luma_Rebuild can be used in many scripts so it's problem for now, avoid use float (32bit) with it if you processes chroma
qtgmc in other hand has no problem but since there are a
bug
will see the other scripts soon and then report back
edit: the same bug in qtgmc float (32bit) can be in other scripts