Thanks everyone for all the support. After fixing the TZ for the HE, I was able to
upgrade cluster compatibility.
Having said that, I still had to go through the properties of over 100 VMs to
verify/correct the TZ because of that nasty bug.
And of course I had to deal with the VirtIO re-enumeration problem affecting all my
Windows VMs because of the compatibility level upgrade. Fortunately there are very few
Windows VMs. Mostly a Linux shop here. :)
Thanks again. Have a great weekend.