KVM - virt manager - no VM won't boot - VMs CPU at 100%

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Virtual Machines will not start after last tumbleweed upgrade

After the last Tumbleweed upgrade to today’s 20250328 none of my qemu Virtual Machines boot anymore. When I start them up they hung up in a perpetual black screen and working 100% of the CPU, but absolutely nothing else happens. No console, no image, no error message. I usually manage the VMs with virt-man, but I also tried virt-viewer and qemu cli but nothing happened… Anyone else with the same issue?