Im having that problem too. Are there any solution for this?
Same issue, always where at least one dimension of the full image is smaller than the dimensions used for add_image_size. Is this the same thing you’re experiencing?
Example:
I have a custom add_image_size for ‘homepage-thumb’ set to 500 X 200.
I have a full size image of 450 × 679.
I set the lock aspect ratio to 500, 200. It seems to be working so far, and the ratio looks good as I select the area to crop. However, it incorrectly saves the image as 450 X 200, which is not the 500:200 or 5:2 ratio as requested.
Also experiencing an issue with custom image sizes.
I’m using the following in my functions file, in the ‘after_setup_theme’ hook
add_image_size( 'icon', 50, 50, true);
When using Scissors Continued to crop the ‘icon’ sized image, the “crop guide” which you can drag or resize, doesn’t maintain the ratio as indicated when calling the add_image_size function.
The resulting cropped custom image does turn out to be the right size, but obviously you couldn’t specify exactly where you wanted it to be cropped.