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FYI - the steps I do to get log data
SSH to OPNSense
su -
8 - Shell
cat /var/log/system/latest.log | grep ppp

You can look at previous days logs
cd /var/log/system
ls -ltr

I just updated to OPNsense 23.1.7_3

Do I need to do anything else? At thhat time I went into gateways and checked the "Disable Host Route" option to fix the problem. I could not find any documentation on what exactly that option is used for other than the help item which said "Do not create a dedicated host route for this monitor.".

I think this just masks the issue as without the route to the IP Address that is being used to monitor the link then the monitor ping packet will just be sent down the default gateway and thus not really test the link that you want it too.