diff --git a/core/lib/Drupal/Core/Theme/Registry.php b/core/lib/Drupal/Core/Theme/Registry.php
index 0cb00a6..325c74e 100644
--- a/core/lib/Drupal/Core/Theme/Registry.php
+++ b/core/lib/Drupal/Core/Theme/Registry.php
@@ -610,7 +610,6 @@ protected function completeSuggestion($hook, array &$cache) {
       && $pos = strrpos($previous_hook, '__')) {
       if (isset($cache[$previous_hook]) && !$incomplete_previous_hook && isset($cache[$previous_hook]['incomplete preprocess functions'])) {
         $incomplete_previous_hook = $cache[$previous_hook];
-        unset($incomplete_previous_hook['incomplete preprocess functions']);
       }
       $previous_hook = substr($previous_hook, 0, $pos);