Recoverable fatal error: Object of class Drupal\Core\Session\AccountProxy could not be converted to string in Drupal\loggable\Logger\Loggable->log() (line 138 of loggable/src/Logger/Loggable.php)

Recoverable fatal error: Object of class Drupal\Core\Session\AccountProxy could not be converted to string in Drupal\loggable\Logger\Loggable->log() (line 138 of /app/web/modules/contrib/loggable/src/Logger/Loggable.php)

Occurs when the $context in Loggable::log() contains a non-string value when it's passed in to strtr() to generate the message text.

This may affect D7 as well.