custom sanitization - cloneable group - php error

Hello,
The sanitization function of cloneable group throws a PHP error and there is no action.
details are below.
Metabox

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'        => __( 'List1', 'your-text-domain' ),
        'id'           => 'list1',
        'post_types'   => ['page'],
        'storage_type' => 'custom_table',
        'table'        => 'custom',
        'fields'       => [
            [
                'name'              => __( 'List', 'your-text-domain' ),
                'id'                => $prefix . 'list_data',
                'type'              => 'group',
                'clone'             => true,
                'sort_clone'        => true,
                'add_button'        => __( 'Add more job', 'your-text-domain' ),
                'sanitize_callback' => 'list_sanitize',
                'fields'            => [
                    [
                        'name'     => __( 'Title', 'your-text-domain' ),
                        'id'       => $prefix . 'jtitle',
                        'type'     => 'text',
                        'required' => true,
                        'columns'  => 6,
                    ],
                    [
                        'name'     => __( 'Job Page_URL', 'your-text-domain' ),
                        'id'       => $prefix . 'jurl',
                        'type'     => 'url',
                        'required' => true,
                        'columns'  => 6,
                    ],
                    [
                        'name' => __( 'Description', 'your-text-domain' ),
                        'id'   => $prefix . 'shdp',
                        'type' => 'textarea',
                    ],
                    [
                        'name'     => __( 'Deadline Date', 'your-text-domain' ),
                        'id'       => $prefix . 'dedte',
                        'type'     => 'date',
                        'required' => true,
                        'columns'  => 4,
                    ],
                    [
                        'name'     => __( 'Subject', 'your-text-domain' ),
                        'id'       => $prefix . 'subli',
                        'type'     => 'select_advanced',
                        'options'  => [
                            'chemistry'     => __( 'Chemistry', 'your-text-domain' ),
                            'physics'       => __( 'Physics', 'your-text-domain' ),
                            
                        ],
                        'required' => true,
                        'columns'  => 4,
                    ],
                    [
                        'name'     => __( 'Added/Updated Date', 'your-text-domain' ),
                        'id'       => $prefix . 'aupd',
                        'type'     => 'date',
                        'required' => true,
                        'columns'  => 4,
                    ],
                ],
            ],
        ],
    ];

    return $meta_boxes;
}

sanitize function

function list_sanitize($value){
    //list - group clone
    
        $jtitle = isset( $value['jtitle'] ) ? $value['jtitle'] :[]; //title
        if( !empty($jtit) ){
            $value['jtitle'][0] = sanitize_text_field($jtitle[0]); // PHP error 1 - Only the first byte will be assigned to the string offset
        }
        $jurl = isset( $value['jurl'] ) ? $value['jurl'] :[]; //url
        if( !empty($joburl) ){
            $value['jurl'][0] = esc_url_raw($jurl[0]);
        }
        $shdp = isset( $value['shdp'] ) ? $value['shdp'] :[]; //short description
        if( !empty($shdp) ){
            $value['shdp'][0] = sanitize_textarea($shdp[0]); //PHP error 2 - Only the first byte will be assigned to the string offset
        }
        $dedte = isset($value['dedte'] ) ? $value['dedte'] :[]; // deadline date
        if( $dedte[0] <= date('Y-m-d') ){
            $value['dedte'][0] = '0000-00-00';
        }
    
    return $value;
    
}

PHP error
1. Only the first byte will be assigned to the string offset
2. Only the first byte will be assigned to the string offset