Sorry but the Isuue is not full resolved because the example in
file config_defaults_inc.php line 1499 is still wrong.

IMHO it should look like:

e.g., $g_log_level = LOG_EMAIL | LOG_EMAIL_RECIPIENT | LOG_FILTERING;

The example now looks as follows:
e.g., $g_log_level = LOG_EMAIL | LOG_PROJECT | LOG_FILTERING | LOG_AJAX;

Sorry that i reopen the Issue again but the example is still wrong.

Maybe my reports are not clear to see the difference?
Here is NO LOG_PROJECT level. Instead of that here is a LOG_EMAIL_RECIPIENT.
(see also at constant_inc.php)

Hope now you can fix the Issue finally.