Slug is changing when I use WP_Query in a metabox of a post

Question

I think that I already found the problem. From wordpress get_posts documentation the have an example of get_post

<ul>
<?php

global $post;
$args = array( 'posts_per_page' => 5, 'offset'=> 1, 'category' => 1 );

$myposts = get_posts( $args );
foreach ( $myposts as $post ) : setup_postdata( $post ); ?>
    <li>
        <a href="https://wordpress.stackexchange.com/questions/273344/<?php the_permalink(); ?>"><?php the_title(); ?></a>
    </li>
<?php endforeach; 
wp_reset_postdata();?>

</ul>

And the problem is the variable $post inside the loop, I am not sure if maybe because it cause conflicts with the other global variable $post in the line #4.

So I changed my code from this:

$countries = get_posts(array(
    'post_type' => 'country',
    'post_status' => 'publish',
    'posts_per_page' => -1,
    'orderby' => 'title',
    'order'   => 'ASC',
));    
?>
<p>
<!-- my custom value Select -->
<label for="location_country_id">Country:</label>
<select name="location_country_id" id='location_country_id'>
    <option value=""> -- choose Country -- </option>
    <?php 
    if ( $countries ):
        foreach  ( $countries as $post ) :  setup_postdata($post);
        $selected = '';

        if ( $current_country == $post->ID)
        {
            $selected = 'selected';                
        }
    ?>
        <option value="<?php echo esc_attr($post->ID); ?>" <?=$selected?>><?php echo esc_html($post->post_title); ?></option>
    <?php endforeach; 
        /* Restore original Post Data */
        wp_reset_postdata();
    endif;
    ?>
</select>
</p>

For this

$countries = get_posts(array(
    'post_type' => 'country',
    'post_status' => 'publish',
    'posts_per_page' => -1,
    'orderby' => 'title',
    'order'   => 'ASC',
));    
?>
<p>
<!-- my custom value Select -->
<label for="location_country_id">Country:</label>
<select name="location_country_id" id='location_country_id'>
    <option value=""> -- choose Country -- </option>
    <?php 
    if ( $countries ):
        foreach  ( $countries as $country ) :  setup_postdata($country);
        $selected = '';
        //if($player->id ==  $item->title)
        if ( $current_country == $country->ID)
        {
            $selected = 'selected';                
        }
    ?>
        <option value="<?php echo esc_attr($country->ID); ?>" <?=$selected?>><?php echo esc_html($country->post_title); ?></option>
    <?php endforeach; 
        /* Restore original Post Data */
        wp_reset_postdata();
    endif;
    ?>
</select>
</p>

and No more break slug of the post.

I hope this help somebody else.

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