All AFM reports stop working when you add the device in BIG-IQ. As I was not able to copy the configuration while downgrading from 13.1.0.7 to 13.1.0.5, BIG-IQ lost the device trust, and that is why the reports worked in that version. I noted it after adding the device again into BIG-IQ because the reports simply stopped again. Only to be very sure about it I have upgraded it to 13.1.0.8 and, seeing that the reports were still not working, I removed the device from BIG-IQ. After that all the local AFM reports came back to life.
This is not a version thing, nor even a bug. Maybe only an annoying new feature. It makes some sense considering that since 13.1, or when I started to note this behavior, it is not even possible anymore to enable local and remote logging at same time.