I have a recent thread trying to track down why my recently installed ZEN17 is super inconsistent with triggering the relay (as well as a recently opened ticket with Zooz). I wonder if you figured out the fix here with the 1 second delay.
I have found that LGK's app consistently works, and it may be due to the fact that part of his code defaults to a 2 second delay. Also, @velvetfoot stated a similar spotty experience coinciding with a recent Hubitat update, so perhaps this will fix the issue for them as well.
Thanks for sharing. The few times I've tested it have worked so far.