I have one zwave device an ecowitt tilt sensor that is working showing open and close but no messages are appearing in the zwave logs.. I was testing the zen16 which is now directly connected to the c8 vs haveing 2-3 hops in the c7 to see how its routes changed during actual usage when i noticed this anomaly..
same thing happened on closing. the sensor shows close.. no zwave event came accross in the zwave logs.
I am having similar issue but haven't noticed any issue so I haven't posted about it. I don't think any of my Z-Wave devices are generating messages in Zwave logs. I haven't kept the logs open long enough to confirm but will now. Almost all of my Zwave devices are passive sensors so there is not a lot of traffic and I can't induce.
I'm with @JasonJoel on that. If you want to see more, turn on debug logging for that device then open a live log while operating the device. Also you should see stuff in the event log when the ecolink wakes up to report battery and whatnot.
It appears thar you that for some reason only certain sensors types but not all do, as you say, not have incoming messages shown so maybe its some obscure driver option?