Hey @brad,
now I have the new Scarlett 8i6 3rd Gen next to me.
It is exactly the same behavior. I get those strange values as posted above. When I click on “ASIO Control Panel”, the Focusrite Panel opens and I can set a “standard” value like 16, 32, 64, 128, etc. pp. But those values do not show up in Cantabiles buffer-size-settings. If I confirm everything and run Cantabiles audio-engine, the focusrite-symbol in the task bar tells me that the buffer-size got overwritten with the size from the Cantabile-Audio-Engine-Setting.
Hm… I don’t know if it’s just a cosmetic thing or if there is something wrong… but I thought it’s worth reporting.