After ESXi and firmware upgrade, it is possible to find X710 network adapters disappeared from vmnic list. Meanwhile X710 network adapters may show as "154b".
"lspci" output
####:##:##.# Ethernet controller: Intel(R) Ethernet Controller X710 for 10GbE SFP+
####:##:##.# Ethernet controller: Intel Corporation Device 154b
####:##:##.# Ethernet controller: Intel Corporation Device 154b
####:##:##.# Ethernet controller: Intel Corporation Device 154b
Reach out to hardware vendor for further investigation.