Migration failure between two nodes

I have two nodes, say A and B. I upgraded both from Proxmox 6.4 to 7 a couple of weeks ago. The upgrade on A went well. However, after the upgrade on B, virtualization didn't work. When I tried to open an Ubuntu VM, I got a message that virtualization wasn't working and a suggestion to turn off qemu on the machine or change the bios. Node B is a Proctectli 6-port i3 machine. It has two SSDs, the second named Common, which is also the case on Node A.

When I disabled qemu, the VM would run...

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