Wordpress - is_page_conditional - wordpress

Question

I am struggling really hard with the is_page_template Conditional.
The problem is that when I "include" my template functions file (country_template_functions.php) into my functions.php file, the is_page_template conditional doesn't work anymore.
If I remove the "include(template...)" from my functions.php it does work again, but this is no solution since the file has to be included into the functions.php to make it work.
Can anyone explain me what might be wrong?
The is_page conditional works in both cases.
if (file_exists(THESIS_CUSTOM . '/country_template_functions.php')){
include(THESIS_CUSTOM . '/country_template_functions.php');
}
function test() {
if ( is_page_template( "country_template.php" ) ){
echo "is page template works";
}
}
add_action('thesis_hook_before_header','test');
I am using the Thesis Theme.
EDIT:
This seems to cause the problem but not sure exactly why. It causes that I cannot use the is_page_template after the thesis_hook_before_content_area
add_action('thesis_hook_before_content_area', 'country_page_template_swap_before_content');
function country_page_template_swap_before_content(){
if (is_page()) {
global $post;
global $swapped_post;
$page_template = get_post_meta($post->ID, '_wp_page_template', true);
if($page_template == 'country_template.php'){
update_post_meta($post->ID, '_wp_page_template', 'custom_template.php');
$swap_id = time();
update_post_meta($post->ID, '_country_template_swapped', $swap_id);
$swapped_post = $post;
}
else{
$template_swapped = get_post_meta($post->ID, '_country_template_swapped', true);
if(!empty($template_swapped)){
$swapped_post = $post;
}
}
}
}