Crops not saving – 3rd party plugin at fault (EWWW)

This is not so much a support question, as it is a support suggestion to everyone with the same issue

Combined with EWWW Image Optimizer, your cropped images won’t save because EWWW detects existing files and skips re-compressing, using the old file.

to prevent this,

(wp-config.php)

/**
 * Set EWWW in "always overwrite" mode to allow Manual Image Crop to function
 */
define('EWWWIO_EDITOR_OVERWRITE', true);