diff --git a/includes/class-helpers.php b/includes/class-helpers.php
index 0fb6688..76f0263 100644
--- a/includes/class-helpers.php
+++ b/includes/class-helpers.php
@@ -11,7 +11,7 @@ final class Helpers
     private static array $page_unic_cache = [];
     private static int $bypass_depth = 0;
 
-    private static function acf_ready(): bool
+    public static function acf_ready(): bool
     {
         return \did_action('acf/init') > 0;
     }
diff --git a/includes/class-redirect.php b/includes/class-redirect.php
index b66ff38..44a3f95 100644
--- a/includes/class-redirect.php
+++ b/includes/class-redirect.php
@@ -30,12 +30,11 @@ final class Redirect
         }
 
         $candidates = \get_posts([
-            'name'             => $slug,
-            'post_type'        => 'page',
-            'post_status'      => ['private', 'publish'],
-            'posts_per_page'   => 1,
-            'no_found_rows'    => true,
-            'suppress_filters' => false,
+            'name'           => $slug,
+            'post_type'      => 'page',
+            'post_status'    => ['private', 'publish'],
+            'posts_per_page' => 1,
+            'no_found_rows'  => true,
         ]);
         if (empty($candidates)) {
             return;
@@ -43,7 +42,7 @@ final class Redirect
 
         $candidate_id = (int) $candidates[0]->ID;
 
-        if (!\function_exists('get_field')) {
+        if (!Helpers::acf_ready() || !\function_exists('get_field')) {
             return;
         }
         $rows = \get_field('page_unic', 'option');
@@ -71,7 +70,7 @@ final class Redirect
                 static fn () => \get_permalink($orig_id)
             );
             if (!is_string($orig_permalink) || $orig_permalink === '') {
-                return;
+                continue;
             }
             $path_only = Helpers::remove_domain_link($orig_permalink);
             $redirect_to = '/' . $term->slug . $path_only;
diff --git a/tests/ZRedirectDoingAjaxTest.php b/tests/RedirectDoingAjaxTest.php
similarity index 59%
rename from tests/ZRedirectDoingAjaxTest.php
rename to tests/RedirectDoingAjaxTest.php
index bc32ad8..775f1e9 100644
--- a/tests/ZRedirectDoingAjaxTest.php
+++ b/tests/RedirectDoingAjaxTest.php
@@ -8,12 +8,17 @@ use WPMultiCity\Redirect;
 /**
  * Isolated test for the DOING_AJAX bail-out in Redirect::handle().
  *
- * Must be in a separate file sorted AFTER RouterTest so that defining the
- * DOING_AJAX constant does not contaminate Router::route() tests in RouterTest,
- * which also bails early when DOING_AJAX is true.
+ * Isolation is achieved via @runInSeparateProcess on the test method, which
+ * forks a fresh PHP process so that defining the DOING_AJAX constant cannot
+ * contaminate other tests (e.g. RouterTest). The previous Z-prefix ordering
+ * hack is no longer needed.
  */
-final class ZRedirectDoingAjaxTest extends TestCase
+final class RedirectDoingAjaxTest extends TestCase
 {
+    /**
+     * @runInSeparateProcess
+     * @preserveGlobalState disabled
+     */
     public function test_bail_when_doing_ajax(): void
     {
         if (!\defined('DOING_AJAX')) {