Redirection plugin: ignore the files in the wp-content/cache dir because they are always temporary.

functions.php

<?php 

/**
 * Redirection plugin: ignore the files in the wp-content/cache dir because they are always temporary.
 */
function child_theme_ignore_cachefiles($insert) {
    if (isset($insert['url']) && false !== strpos($insert['url'], '/wp-content/cache/')) {
        $insert = false;
    }
 
    return $insert;
}
add_filter('redirection_404_data', 'child_theme_ignore_cachefiles');