Issues booting Ubuntu VM with hypervisor.cpuid.v0 = false

I have had a Plex server running in ESXi 6.7u3 on an Ubuntu Bionic Beaver instance for nearly 5 months. During this time it had a GTX1080 connected in pass through. For this to work properly, hypervisor.cpuid.v0 had to be set to false. This all worked wonderfully until today. I rebooted the Ubuntu instance because it was behaving poorly with a certain transcode. The machine didn’t reboot. The last message it would display during a boot up is “x86: booting smp configuration:”. Nothing would get the VM to boot except removing hypervisor.cpuid.v0 = false from the advanced configuration. This means I am unable to use hardware accelerated transcoding on my Plex VM. Any ideas on what could have changed that made this stop working?

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