Me too - I followed up on my existing ticket and asked for the firmware rollback.
Before rollback I had version 1.59.0-1.13.2
After rollback I had version 1.59.0-1.8.15
With the latter version, after a ST hub reboot, all z-wave functionality is restored as expected.
They were most accommodating of my request, asked no questions and made the change for me within about an hour of my email. So it might be worth doing for others who have the same problem!