Regenerate thumbnails unexpected resolution (96 x 96)

I’m using WP CLI wp media regenerate to resize my thumbnails.

I’ve noticed something a bit weird. The original image I upload is a JPEG with a resolution (DPI) of 72. The images that are generated have a resolution of 96.

Is this something WordPress core is doing?

Here’s what I’m seeing via Tools > Site Health > Media Handling

Here are the image sizes defined via Settings > Media

• Thumbnail: 150 x 150
• Medium Size: 300 x 300
• Large Size: 1200 x 668

And then via my functions, I have the following image sizes defined:

function mytheme_add_custom_image_sizes() {
    add_image_size('landscape-large-1x', 600, 334, true);
    add_image_size('landscape-large-2x', 1200, 668, true); // Largest image available
    add_image_size('landscape-medium-1x', 450, 251, true);
    add_image_size('landscape-medium-2x', 900, 502, true);
    add_image_size('landscape-small-1x', 384, 214, true);
    add_image_size('landscape-small-2x', 768, 428, true);
    add_image_size('landscape-smallest-1x', 324, 180, true);
    add_image_size('landscape-smallest-2x', 648, 360, true);
    add_image_size('square-1x', 96, 96, true); 
    add_image_size('square-2x', 192, 192, true);
}
add_action('after_setup_theme', 'mytheme_add_custom_image_sizes');

It’s also worth mentioning, that I have the following image adjustments via functions.php:

/**
 * Remove srcset width limitation
 */
function mytheme_remove_max_srcset_image_width($max_width) {
    return false;
}
add_filter('max_srcset_image_width', 'mytheme_remove_max_srcset_image_width');

/**
 * Remove default images sizes
 */
function mytheme_remove_default_image_sizes($sizes) {
    unset($sizes['1536x1536']); // Introduced in WP 5.3
    unset($sizes['2048x2048']); // Introduced in WP 5.3
    return $sizes;
}
add_filter('intermediate_image_sizes_advanced', 'mytheme_remove_default_image_sizes');

/**
 * Remove large "scaled" images
 */
add_filter('big_image_size_threshold', '__return_false');