Windows VMs freezing during reboots after patching

I have noticed that as of a few months ago, my Windows VMs in 3 different environments are failing to reboot successfully after patching. I automate patching to happen during non-business hours, and in 3 different environments I have logged in on the day following patches and found that the VMs never came back up. They were stuck at the screen with the Windows logo and the circular dotted spinning thing. After stopping the VMs in Proxmox and then starting them, they would finish their reboot...

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