This morning I went through and excluded and re-paired all six Zen25 double plugs with S2 Unauthenticated per @agnes.zooz 's recommendation -->
I then ran a z-wave repair after all of them were in their locations in the house. I also reduced all of the types of monitoring to 24 hours for each plug. I was excited because they all seemed to be working! 
But after a couple of hours they pretty much became hit or miss -- mostly miss -- if I issue them a command from HE. The logs, as best I can tell, do not indicate anything is wrong. I have two of these double plugs within 6 ft of the hub; one of them seems to work fairly reliably and the other one doesn't. So in total 1 of the 6 Zen 25 double plugs is working reliably. As you can see from the screenshot of Z-Wave details below, nothing about them looks particularly abnormal. The "Office Cabinet Zooz Double Plug" is the only one that has been more or less reliably working.
Can you confirm if you included it with S2 Unauthenticated security level @lwbenso? The plugs may need to be re-included after the platform update.
@bcopeland @agnes.zooz The problem that I am having is that I have 6 Zen 25 double plugs and all but one pretty much are non-functional - I tell HE to turn them on or turn them off and nothing happens. Additionally when I do have them on they periodically turn themselves off and immediately back on - seemingly identical to this issue that was already posted but not responded to Issue with Zooz ZEN25 plugs . I am fairly certain that this off/on phenomenon is related to it being paired in S0...this definitely wasn't happening yesterday. The problems I'm encountering with these plugs are I can pretty confidently say are an HE problem (worked fine on ST before I switched) and not antennagate. To replicate my problem I would recommend moving your Zen25 double plug beyond a distance where it will connect directly the the hub. Then I would test it's functionality over the course of a few hours/a day. Mine seems to work in waves, where they might respond immediately then be pretty much non-responsive again for long stretches of time. I don't have proof but I believe that these double plugs are also slowing down my z-wave network, other devices don't seem so snappy to respond when all 6 of these are plugged in and active.
Have you tried moving the plug farther away from your hub, but where other Z-Wave devices are functioning OK?
@danabw I have six of these double plugs:
- Plug 1 (Office Cabinet Zooz Plug): 10 inches from hub (same room)
- Plug 2 (Office TV Zooz Double Plug): 8 ft from hub (same room)
- Plug 3 (Kitchen Above Microwave Zooz Double Plug): 1 room away, approx 20ft from hub
- Plug 4 (Kitchen Above Fridge Zooz Double Plug): 1 room away, approx 20 ft from hub
- Plug 5 (Living Room TV Zooz Double Plug): across the house/3 walls, approx 50ft from hub
- Plug 6 (Master TV Zooz Double Plug): across the house/3 wall, approx 50ft from hub
Overall my mesh is pretty good and all of my devices (except a pesky lock and these double plugs) are working well enough that I'm satisfied. I have many Inovelli light switches throughout the house so I don't think its a z-wave network issues so much as an HE issue (because they were working fine in Smartthings).
If it helps-- Now is 2020-11-19 7:30:00 PM and I issued a command to turn this double plug off in the kitchen - Plug 3. As you can see the last activity of this plug was at 6:37p. So it may be a clue
Thank you @steve.maddigan @Derakkon for sharing your setups
