[Resolved] Switching languages on search results page it redirects to incorrect page

I found the problem, at least for my setup.

That page ID referred to the "shop page", a WooCommerce page.

I deleted the page and dynamically changed the "href" value of the link in the language selector, adding a JS function.

The point is that using plugins (e.g. FiboSearch) to allow searching by SKU and only showing products as search results creates some problems with the language selector.

The JS code, added via function.php is this:

function add_custom_script() {
?>
<script type="text/javascript">
document.addEventListener("DOMContentLoaded", function() {
// Check if querystring 's' is present
var queryString = window.location.search;
var urlParams = new URLSearchParams(queryString);
if (!urlParams.has('s')) {
return; // If 's' is not present, stop the script
}

// Function to construct the URL based on the language
function constructUrlLanguage(baseUrl, language) {
var url = new URL(baseUrl);
var pathname = url.pathname;

// Adjust the path based on the language
if (language === 'it') {
pathname = pathname.replace('/en/', '/');
} else if (language === 'en') {
if (!pathname.includes('/en/')) {
pathname = '/en' + pathname;
}
}
url.pathname = pathname;

// Update the 'lang' parameter
url.searchParams.set('lang', language);

return url.href;
}

// Update the href for Italian
var linkIt = document.querySelector('#menu-item-wpml-ls-39-it a');
if (linkIt) {
linkIt.href = buildUrlLanguage(window.location.href, 'it');
}

// Update the href for English
var linkEn = document.querySelector('#menu-item-wpml-ls-39-en a');
if (linkEn) {
linkEn.href = buildLanguageUrl(window.location.href, 'en');
}
});
</script>
<?php
}
add_action('wp_footer', 'add_custom_script');

If anyone was in the same situation as me and if they needed it.

Thanks for the support, Marcel.