In all recent upgrades of CiviCRM Wordpress (to 5.71.x, 5.72.x and 5.73.0), the DB upgrade process executing URL
https://<mysite>/wp-admin/admin.php?page=CiviCRM&q=civicrm%2Fupgrade%2Fqueue%2Frunner&reset=1&qrid=CRM_Upgrade
freezes on message [Executed: Update all reserved message templates].
Issuing again the URL above solves the problem, but I wonder why I need to issue this URL twice. I am using Firefox as browser.