No help, I know, but I'm having the same kind of frustration. I ditched my x10 gear because it was unreliable and I expected (naively) this new gear would be set-it-and-forget-it. While it's much better than the x10 gear I wouldn't dare leave home and not check on it at least twice every day. Automations just quit for no apparent reason most of the time.
I had one just yesterday. I do all my processing in node-red and the back yard lights are supposed to come on when a motion sensor "sees" me. It didn't happen so I looked at the device logs on HE and the NR logs on its host. It all showed the expected events but neither of the switches involved actually turned on. So I used my Hubitat Dashboard - Android dashboard app and they both worked as expected.
([RELEASE] Hubitat Dashboard - Android dashboard app)
After doing that the automation worked as expected. 
I have a mystery like that about every week.
