Problem with "PHP Warning: Trying to access array offset on value of type int in"

one text

I am getting this problem in my php 8.0 log file in wordpress:

PHP Warning: Trying to access array offset on value of type int in /home/(the domain)/public_html/wp-includes/class-wp-list-util.php on line 170

When I check that file in that line, this is what i see:

     *               corresponding to `$index_key`. If `$index_key` is null, array keys from the original
     *               `$list` will be preserved in the results.
     */
    public function pluck( $field, $index_key = null ) {
        $newlist = array();

        if ( ! $index_key ) {
            /*
             * This is simple. Could at some point wrap array_column()
             * if we knew we had an array of arrays.
             */
            foreach ( $this->output as $key => $value ) {
                if ( is_object( $value ) ) {
                    $newlist[ $key ] = $value->$field;
                } else {
                    $newlist[ $key ] = $value[ $field ];
                }
            }

the line 170 is this :

$newlist[ $key ] = $value[ $field ];