Automatic discounts not being applied after server updates

Created by: lkuttner

Following updates to PHP 7.3.29 and MySQL 5.7.34 earlier this month, we discovered that discounts are no longer being automatically applied to event registration forms, public or back-end. The discount codes do work when applied manually. No errors are being logged. We just updated CiviDiscount to 3.8.2 from an older version, but that did not resolve the problem. We are on CiviCRM 5.33.5 on Drupal 7.8.1. Any ideas what might be causing this? Thanks very much.