Stan Ozier
--- a/core/modules/file/src/Element/ManagedFile.php
+++ b/core/modules/file/src/Element/ManagedFile.php

    // Add the extension list to the page as JavaScript settings.
    if (isset($element['#upload_validators']['file_validate_extensions'][0]) || isset($element['#upload_validators']['FileExtension']['extensions'])) {
--- a/core/modules/file/file.module
+++ b/core/modules/file/file.module
-    $descriptions[] = t('@size limit.', ['@size' => ByteSizeMarkup::create($upload_validators['file_validate_size'][0])]);
-  }
+
  if (isset($upload_validators['FileSizeLimit'])) {
    $descriptions[] = t('@size limit.', ['@size' => ByteSizeMarkup::create($upload_validators['FileSizeLimit']['fileLimit'])]);
  }

-  if (isset($upload_validators['file_validate_extensions'])) {
-    @trigger_error('\'file_validate_extensions\' is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Use the \'FileExtension\' constraint instead. See https://www.drupal.org/node/3363700', E_USER_DEPRECATED);
-    $descriptions[] = t('Allowed types: @extensions.', ['@extensions' => $upload_validators['file_validate_extensions'][0]]);
-  }
  if (isset($upload_validators['FileExtension'])) {
    $descriptions[] = t('Allowed types: @extensions.', ['@extensions' => $upload_validators['FileExtension']['extensions']]);
  }

  if (isset($upload_validators['file_validate_image_resolution']) || isset($upload_validators['FileImageDimensions'])) {