Foreman created vsphere objects using VMXNET3 interface.

It correctly does so.

However, when looking up the respective server's network settings in foreman it shows that vsphere interface type
E1000 is being used. After verifying inside vsphere it correctly used VMXNET3.

So for some weird, possibly hardcoded reason it shows up as using E1000 instead of VMXNET3 in both the network interface overview, as inside the network interface whe you select Edit.

VirtualE1000 @ network-somenumber..

NIC: E1000

PowerCLI C:\> get-vm -Name te-k8-olmo202.df1.my.net | get-networkadapter

Name                 Type       NetworkName  MacAddress         WakeOnLan
                                                                  Enabled
----                 ----       -----------  ----------         ---------
Network adapter 1    Vmxnet3    kbrnts-1006  00:xxxx:5f:00       True
Network adapter 2    Vmxnet3    core-depl... 00:xxxxx:95:bc       True