diff --git a/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php b/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php
index 5eee57aa200cc627f10104f59944712a3b71af1b..3cd8d6856500ba50ca7e44317d110c41b0c33f55 100644
--- a/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php
+++ b/core/lib/Drupal/Component/Transliteration/PhpTransliteration.php
@@ -105,55 +105,31 @@ public function removeDiacritics($string) {
    * {@inheritdoc}
    */
   public function transliterate($string, $langcode = 'en', $unknown_character = '?', $max_length = NULL) {
-    $results = [];
+    $result = '';
     $length = 0;
+    // Split into Unicode characters and transliterate each one.
+    foreach (preg_split('//u', $string, 0, PREG_SPLIT_NO_EMPTY) as $character) {
+      $code = self::ordUTF8($character);
+      if ($code == -1) {
+        $to_add = $unknown_character;
+      }
+      else {
+        $to_add = $this->replace($code, $langcode, $unknown_character);
+      }
 
-    // Split on words to handle mixed case per word.
-    $words = explode(' ', $string);
-    foreach ($words as $key => $word) {
-      $results[$key] = '';
-
-      // String is mixed case if it consists of both uppercase and lowercase
-      // letters. To accurately check this, remove any numbers and check that
-      // remaining characters are not all uppercase and not all lowercase.
-      $alpha_string = preg_replace('/\\d/', '', $word);
-      $mixed_case = (strlen($alpha_string) > 1 && mb_strtolower($alpha_string) !== $alpha_string && mb_strtoupper($alpha_string) !== $alpha_string);
-
-      // Split into Unicode characters and transliterate each one.
-      foreach (preg_split('//u', $word, 0, PREG_SPLIT_NO_EMPTY) as $character) {
-        $code = self::ordUTF8($character);
-        if ($code == -1) {
-          $to_add = $unknown_character;
-        }
-        else {
-          $to_add = $this->replace($code, $langcode, $unknown_character);
-        }
-
-        // Check if this exceeds the maximum allowed length.
-        if (isset($max_length)) {
-          $length += strlen($to_add);
-          if ($length > $max_length) {
-            // There is no more space.
-            $results = array_filter($results);
-            return implode(' ', $results);
-          }
-        }
-
-        // If this is a capitalised letter of a mixed case word, only capitalise
-        // the first letter and lowercase any subsequent letters.
-        if ($mixed_case && strlen($to_add) > 1 && mb_strtoupper($to_add) === $to_add) {
-          $to_add = ucfirst(strtolower($to_add));
+      // Check if this exceeds the maximum allowed length.
+      if (isset($max_length)) {
+        $length += strlen($to_add);
+        if ($length > $max_length) {
+          // There is no more space.
+          return $result;
         }
-
-        $results[$key] .= $to_add;
       }
 
-      // Add space to count for max length.
-      $length++;
+      $result .= $to_add;
     }
 
-    $results = array_filter($results);
-    return implode(' ', $results);
+    return $result;
   }
 
   /**
diff --git a/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php b/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php
index eb468c8b80309484bb28680dbaf9ae76f975074c..924f3e93000b8799b7054da9574578f052cf0604 100644
--- a/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php
+++ b/core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php
@@ -146,19 +146,6 @@ public function providerTestPhpTransliteration() {
       ['en', chr(0xF8) . chr(0x80) . chr(0x80) . chr(0x80) . chr(0x80), '?'],
       // Max length.
       ['de', $two_byte, 'Ae Oe', '?', 5],
-      // Test strings with mixed case words where a single capital character
-      // results in multiple characters. The first character should remain
-      // capitalised but subsequent resulting characters should be lowercase.
-      // For example a result of the transliteration should be 'Shtrikhkod'
-      // not 'SHtrikhkod'. Numbers should not be used in determining whether a
-      // string is mixed case.
-      ['ru', 'Штрихкод', 'Shtrikhkod'],
-      ['bg', 'Щастие', 'Schastie'],
-      ['bg', 'Щ1', 'SCH1'],
-      ['bg', 'Щ1Щ', 'SCH1SCH'],
-      ['bg', 'Щ1щ', 'Sch1sch'],
-      ['bg', 'Щастие ЩЩЩ', 'Schastie SCHSCHSCH'],
-      ['bg', 'Щастие ЩЩЩ. Щастие! Щастие', 'Schastie SCHSCHSCH. Schastie! Schastie'],
     ];
   }