Was it a power outage or was it an "internet outage"?
I ask since I cannot see anything else than a disconnection which, as stated, would not be IP related. Meaning, you would not see an outage
The reason behind the inactive/disconnected alert is exactly to show other reason behind the "missing connectivity" which are not identified by the "usual" internet outage.
In short, if the agent recognizes an IP outage, it will always log it assuming the software was not stopped or restarted in which case, the outage info it was tracking would be lost.