test meta box conditional logic

add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

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

    $meta_boxes[] = [
        'title'      => __( 'Post Meta', 'your-text-domain' ),
        'id'         => 'post-meta',
        'post_types' => ['post'],
        'fields'     => [
            [
                'name'    => __( 'API version', 'your-text-domain' ),
                'id'      => $prefix . 'api_version',
                'type'    => 'select',
                'options' => [
                    'ver1' => __( 'Version 1', 'your-text-domain' ),
                    'ver2' => __( 'Version 2', 'your-text-domain' ),
                    'ver3' => __( 'Version 3', 'your-text-domain' ),
                ],
            ]
        ],
    ];

    $meta_boxes[] = [
        'title'      => __( 'Version 2', 'your-text-domain' ),
        'id'         => 'version-2',
        'post_types' => ['post'],
        'visible'    => [
            'when'     => [['api_version', '=', 'ver2']],
            'relation' => 'or',
        ],
        'fields'     => [
            [
                'name' => __( 'Button', 'your-text-domain' ),
                'id'   => $prefix . 'button_1x23b7ksihm',
                'type' => 'button',
            ],
            [
                'name' => __( 'Textarea', 'your-text-domain' ),
                'id'   => $prefix . 'textarea_b0zkrtrtzei',
                'type' => 'textarea',
            ],
        ],
    ];

    $meta_boxes[] = [
        'title'      => __( 'Version 3', 'your-text-domain' ),
        'id'         => 'version-3',
        'post_types' => ['post'],
        'visible'    => [
            'when'     => [['api_version', '=', 'ver3']],
            'relation' => 'or',
        ],
        'fields'     => [
            [
                'name' => __( 'Text', 'your-text-domain' ),
                'id'   => $prefix . 'text_vwrjp72xk2q',
                'type' => 'text',
            ],
        ],
    ];

    return $meta_boxes;
}