diff -u b/core/modules/content_moderation/src/EntityTypeInfo.php b/core/modules/content_moderation/src/EntityTypeInfo.php
--- b/core/modules/content_moderation/src/EntityTypeInfo.php
+++ b/core/modules/content_moderation/src/EntityTypeInfo.php
@@ -378,7 +378,7 @@
 
         $invalid_transitions = array_diff_key($this->validator->getPermittedTransitions($entity, $this->currentUser), $this->validator->getValidTransitions($entity, $this->currentUser));
         if ($invalid_transitions) {
-          $labels = array_map(function ($transition) { return strtolower($transition->label()); }, $invalid_transitions);
+          $labels = array_map(function ($transition) { return $transition->label(); }, $invalid_transitions);
           $last = array_pop($labels);
           $invalid_transitions_string = implode(', ', $labels) . ', or ' . $last;
           $latest_revision = $this->getTranslationAffectedRevision($this->moderationInfo->getLatestRevision($entity->getEntityTypeId(), $entity->id()));