Knob-billed Duck, Blue-winged Goose and Maned Duck

I'm using the new AviList to inform the sequence of species here but AviList only includes the major taxonomic ranks and does not tell us which subfamily or tribe a species is assigned to. Previously Knob-billed Duck and Blue-winged Goose have been assigned to the subfamily Tadorninae which includes the shelducks, but AviList's sequence currently places Knob-billed Duck, Blue-winged Goose and Maned Duck after the sawbills (subfamily Merginae) which are themselves after the shelducks (subfamily Tadorninae), implying that the compilers of AviList cannot treat these as part of subfamily Tadorninae any longer. It is not clear to me what subfamily (or subfamilies) these three species are now considered to belong to, so until I have clarity on this I shall group them together here as "miscellaneous ducks".

Knob-billed Duck Sarkidiornis melanotos

Maned Duck Chenonetta jubata

Blue-winged Goose Cyanochen cyanoptera