Struggle with responsive image and focalpoint

I’m trying to get a responsive image that has an aspect ratio of 16:9 for desktop, and 3:4 for mobile portrait, however I always get the 16:9 size.

My graph-ql query is like this:
responsiveImage(imgixParams: {auto: format, fit: crop, crop: focalpoint, h: 810}) {
srcSet
webpSrcSet
sizes
src
width
height
aspectRatio
alt
title
base64
}

It seems that the focalpoint crop never happens!

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