I noticed this back on RC3 but since RC5 came out, I updated and waited to see if it happened again. Back on RC3, it happened to CPU 0 which was assigned to UNRAID. Now it's showing up with CPU 14 which is the last core assigned to a Win10 VM. Task manager in Win10 shows no activity. Remoting into the server, htop does not show 100% utilization. I see it updating at the same rate as the other CPUs.