Condition logic not working in Back-end

Hi,

I'm having an issue with custom fields. Since a couple update past, the conditional logic isn't working on the backend of the site, but works well on the front end.

I tried deactivating everything, change theme, etc, but not luck.

I have a 'Testimonial' CheckboxList field with 2 options. Depending of which one is selected (or both) it shows different options to fill info in.

The weird thing is that if I select an option, after a while (maybe a minute) or randomly the hidden fields are showing, but don't disappear if I uncheck the option.

Here is the code of a test I made to show the issue:

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

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

    $meta_boxes[] = [
        'title'  => __( 'test', 'your-text-domain' ),
        'id'     => 'test',
        'fields' => [
            [
                'name'    => __( 'Checkbox List', 'your-text-domain' ),
                'id'      => $prefix . 'checkbox_list_1',
                'type'    => 'checkbox_list',
                'options' => [
                    1 => __( '1', 'your-text-domain' ),
                    2 => __( '2', 'your-text-domain' ),
                ],
            ],
            [
                'name'    => __( 'Text 1', 'your-text-domain' ),
                'id'      => $prefix . 'text_tzwv68o6dh',
                'type'    => 'text',
                'visible' => [
                    'when'     => [['checkbox_list_1', 'contains', 1]],
                    'relation' => 'or',
                ],
            ],
            [
                'name'    => __( 'Url', 'your-text-domain' ),
                'id'      => $prefix . 'url_gm8gpywfp5',
                'type'    => 'url',
                'visible' => [
                    'when'     => [['checkbox_list_1', 'contains', 2]],
                    'relation' => 'or',
                ],
            ],
        ],
    ];

    return $meta_boxes;
}