[Intl] Explicit check

Author: ro0NL

Data/Generator/LanguageDataGenerator.php

@@ -167,9 +167,9 @@ private function generateAlpha2ToAlpha3Mapping(ArrayAccessibleResourceBundle $me
         $aliases = iterator_to_array($metadataBundle['alias']['language']);
         $alpha2ToAlpha3 = [];
 
-        foreach ($aliases as $alias => $language) {
-            $language = $language['replacement'];
-            if (2 === \strlen($language) && 3 === \strlen($alias)) {
+        foreach ($aliases as $alias => $data) {
+            $language = $data['replacement'];
+            if (2 === \strlen($language) && 3 === \strlen($alias) && 'overlong' === $data['reason']) {
                 if (isset(self::$preferredAlpha2ToAlpha3Mapping[$language])) {
                     // Validate to prevent typos
                     if (!isset($aliases[self::$preferredAlpha2ToAlpha3Mapping[$language]])) {