diff --git a/core/modules/comment/src/CommentAccessControlHandler.php b/core/modules/comment/src/CommentAccessControlHandler.php
index 6e4072d..053c4f9 100644
--- a/core/modules/comment/src/CommentAccessControlHandler.php
+++ b/core/modules/comment/src/CommentAccessControlHandler.php
@@ -98,8 +98,9 @@ protected function checkFieldAccess($operation, FieldDefinitionInterface $field_
         return AccessResult::allowedIfHasPermission($account, 'post comments')->addCacheableDependency($entity);
       }
       // We are editing an existing comment - create only fields are now read
-      // only.
+      // only, except for the bundle.
       $read_only_fields = array_merge($read_only_fields, $create_only_fields);
+      unset($read_only_fields[array_search('comment_type', $read_only_fields)]);
       if (in_array($field_definition->getName(), $read_only_fields, TRUE)) {
         return AccessResult::forbidden();
       }