Also, in addition to the current firmware version, do you happen to know who the prior service provider was for that panel?
Here is an old post referencing a specific circumstance that might come up but it would only be potentially relevant to one provider. It also wouldn’t really make sense in this case considering the sensors were reporting activity for a while, and all the initial sync communication had already occurred.
It looks like the transceiver likely actually stopped working around the time that rear door was opened at 10:20am unless that door was actually left open for a couple hours. Supervision later caught the failure.