Your issues are caused by Hubitat, not the device, but the next hub update is supposed to fix them...
I'm running a C7 and I have a couple of places where the physical layout of the ZEN25 would really be useful. Did the issues in this thread get resolved with the latest HE FW?
Edit - Never mind. I see the other, more recent thread now.
[INCIDENT] ZOOZ Double Plug (MODEL ZEN25)
Definitely change the parameter referred to in that thread if you're going to use the plugs. Mine has been behaving well on my C7. It's in a location not too far from the hub (about 20-25' and through one wall and closet).
Excellent. Thanks.
Shoot - forgot to mention that you'll also want to join it w/no security - when the security dialog appears during pairing uncheck all options so it looks like below.
If you're joined w/security you'll need to exclude and re-include it, unfortunately.
It should show "None" in the second to last column (Security) on the Z-Wave Details page: