Minikube loses track of nodes
There seems to be some issue with minikube v1.20.0 and it also happens on linux with kvm2 driver (my setup) so it is not OS or driver specific.
It also happens on minikube v1.21.0, although it doesn't happen until stopped second time. After the first stop and start all seems to work fine but after second stop I see exactly what you see.
If you want you can create an issue on minikube githib repo and hope developers fix it.