srcset max-width Issue

[michaeljamesdunn]

I'm trying to set the Wordpress image srcset max-width to 2048 (for retina, which is 2x my $content_width of 1024) using the function below, but I always end up getting the full-size image on high-res displays anyway (i.e., sizes="(max-width: 3712px) 100vw, 3712px"). Wordpress appears to globally limit that to 1600 in media.php, so I'm not sure why I would ever be getting the full-size of images greater than 1600. Is there something in Independent Publisher that would be overriding these settings?

/* Set new max srcset width */
add_filter('max_srcset_image_width', function($max_srcset_image_width, $size_array){
    return 2048;
}, 10, 2);