Yeah, that will happen. It's not supposed to be deleted. We can try to fix it, but I think it could have larger implications for special logs.
You need to now set in your rules the log handler. This will force the MWG to call the correct log handler.
I would advise reverting back to a previous configuration if possible.
If you have an SR, please let me know it.
My rule will work for normal transactions (when a user makes a request).
If you start having problems using the error handler/monitoring. The same ruleset could be required to be placed under there as well.
Actually, I've found a configuration backup.
What I did was backup current configuration, then restore old backup (in order to restore default log handlers), and then restored current ruleset, without log handlers.
Your solution does provide a working logs, however, so it would have been a lifesaver, had I not found the backups.