Why does imagecropauto create a black bar at the bottom of an image?

Question

PHP

Hello
There is a banal task. Bring all images to the same size ratio.
Such an algorithm was adopted using the GD
library 1 - crop the original image from extra margins
2 - recalculate new sizes taking into account the desired ratio
3 - create a new image, fill it with white
4 - copy the cropped image to a new image
And that's it OK, BUT the imagecropauto
function draws a black line at the bottom for some reason.

Here is the code

$destImage = __DIR__ . '/064-493-1101.jpg';
$orig_img = imagecreatefromjpeg($destImage);
// обрезаем
$cropped_img = imagecropauto($orig_img , IMG_CROP_THRESHOLD, null, 16777215);
imagejpeg( $cropped_img,  __DIR__ . '/064-493-1101-crop.jpg');
  //Get image width / height
    $crp_w = ImageSX($cropped_img);
    $crp_h = ImageSY($cropped_img);
  
  $crp_ratio = $crp_h / $crp_w;
  
  $ratio = 1.44;
  if ( $crp_ratio < $ratio ) {
    $new_h = $crp_w * $ratio;
    $new_w = $crp_w;
    $dst_x = 0;
    $dst_y = ($new_h - $crp_h) / 2;
  } else {
    $new_h = $crp_h;
    $new_w = $crp_h / $ratio;
    $dst_x = ($new_w - $crp_w) / 2;
    $dst_y = 0;
  }
  
        // создаем основу
  $canvas = imagecreatetruecolor($new_w, $new_h);
  $white = imagecolorallocate($canvas, 255, 255, 255);
  imagefilledrectangle($canvas, 0, 0, $new_w, $new_h, $white);

  // сливаем картинки
  imagecopyresampled($canvas, $cropped_img, $dst_x, $dst_y, 0, 0, $crp_w, $crp_h, $crp_w, $crp_h);
  
  imagedestroy($cropped_img);
  imagedestroy($orig_img);
  
  
imagejpeg( $canvas,  __DIR__ . '/064-493-1101-1.jpg');

original image

cropped image

finite, taking into account the relation

maybe I'm missing something. Tell me who knows
Thank you in advance