PE C6420 NVMe not Displaying with 1 CPU

For our C6420 Blades with NVMes (U.2), when we run them with 1 CPU, they do not display the NVMes, but when we add a CPU (to make it 2 CPUs), they display just fine.

I see nothing in the docs about these blades requiring 2 CPUs installed in order to display the NVMes, so I am wondering what may be the problem here. These are the standard NVMe C6420 blades being used in an NVMe capable C6400 chassis.