I have just done an upgrade to v5.50 and get an immediate:
RuntimeException: CiviCRM has not bootstrapped sufficiently to fire event "hook_civicrm_entityTypes". in Civi\Core\CiviEventDispatcher->dispatch() (line 190 of /var/www/html/sites/all/modules/civicrm/Civi/Core/CiviEventDispatcher.php).
I have a script that does the refresh of a new version and I'm not aware of anything I have changed on my UAT server where I test these things. Has anyone else seen this?
Running on D7 v7.88