I created test switch and assined 3rd nic on it - able to ping. no errors: (vMotion enabled)
There is CDP info from adapters (if it can help):
NIC2:
NIC3:
Console network adapters selection window:
vmnic3 now connected to vSwitch2,but if I remove switch2, and on yellow screen select nic 3 in additional to nic2 - I will lost connection in vSphere/vCenter to this ESXi host after confirm settings change.