Wordpress template approval problem

I've developed a Wordpress template, and I'm looking forward to uploading to the wordpress.org repository, but both its check system and plugin Theme Check give the following message:

  

REQUIRED: Found a Customizer setting that did not have a sanitization callback function. Every call to the add_setting () method needs to have a sanitization callback function passed.

I have tried several possibilities to work around this problem, including trying to use native Wordpress filters, and nothing works.

include / customizer.php (with the same method used by several official templates already approved)

/*
* Footer text
*/

$wp_customize->add_setting(
    'jamanto_customizer_footer_text',
    array(
        'default' => '© 2052',
        'capability' => 'edit_theme_options',
        'transport' => 'refresh',
        'sanitize_callback' => 'jamanto_sanitize_text',
    )
);
$wp_customize->add_control(
    new WP_Customize_Control(
        $wp_customize,
        'jamanto_customizer_footer_text',
        array(
            'label' => __( 'Footer text', 'jamanto' ),
            'section' => 'jm_section_settings',
            'settings' => 'jamanto_customizer_footer_text',
            'type' => 'text',
        )
    )
);

/*
* Sanitize
*/

function jamanto_sanitize_text( $string ) {
    return trim( $string );
}

And the template link in github: link

However, even though displaying this message, in Custom all filters work normally. Also, I noticed that it's not just me, there are several people in the Wordpress forum with the same problem, what can I do?