Hrishikesh
I tried too the VWFNDR app, on my device (the 4a) it goes black trying to capture from the 80mm and 16mm sensors, Iโm able of capturing with the main sensor but it comes out very magenta tinted.
the last seems to be common due to the RAW pipeline the app uses and the sensor on the 4a (https://nothing.community/d/61441), and one is supposed to do post editing.
the black is probably because the other two sensors do not expose RAW the way VWFNDR expects or at all.
on your device does it go black even with the 24mm sensor?