Issue #3226334 by albertosilva, pauger, xjm, smustgrave, K3vin_nl, krisahil: PathAliasManager could not find the alias by the internal path

(cherry picked from commit 9cc7cfaa1c)

core/modules/path_alias/src/AliasManager.php

@@ -221,7 +221,7 @@ class AliasManager implements AliasManagerInterface {
       if (!empty($this->preloadedPathLookups[$langcode])) {
         $this->lookupMap[$langcode] = $this->pathAliasRepository->preloadPathAlias($this->preloadedPathLookups[$langcode], $langcode);
         // Keep a record of paths with no alias to avoid querying twice.
-        $this->noAlias[$langcode] = array_flip(array_diff_key($this->preloadedPathLookups[$langcode], array_keys($this->lookupMap[$langcode])));
+        $this->noAlias[$langcode] = array_flip(array_diff($this->preloadedPathLookups[$langcode], array_keys($this->lookupMap[$langcode])));
       }
     }
 

core/modules/path_alias/tests/src/Unit/AliasManagerTest.php

@@ -259,7 +259,14 @@ class AliasManagerTest extends UnitTestCase {
 
     $language = $this->setUpCurrentLanguage();
 
-    $cached_paths = [$language->getId() => [$path]];
+    // Use a set of cached paths where the tested path is in any position, not
+    // only in the first one.
+    $cached_paths = [
+      $language->getId() => [
+        '/another/path',
+        $path,
+      ],
+    ];
     $this->cache->expects($this->once())
       ->method('get')
       ->with($this->cacheKey)