Stack trace assente in error.loh

[astros3]

$ php -i | grep log_errors
log_errors => On => On
log_errors_max_len => 1024 => 1024
$ php -i | grep error_log
error_log => /var/log/error.log => /var/log/error.log
$ php -i | grep display_errors
display_errors => Off => Off
$ cat test.php 
<?php
trigger_error(null);
throw new Exception;
$ php test.php 
$ tail -n 5 /var/log/error.log 
[26-Apr-2022 09:06:52 Europe/Berlin] PHP Notice:   in /tmp/tmp.FoceFGDBYx/test.php on line 2
[26-Apr-2022 09:06:52 Europe/Berlin] PHP Fatal error:  Uncaught Exception in /tmp/tmp.FoceFGDBYx/test.php:3
Stack trace:
#0 {main}
  thrown in /tmp/tmp.FoceFGDBYx/test.php on line 3

Come vedete per la Notice non c'è lo stack trace, mentre per il Fatal error si.
Perchè?