I can see the controller not being visible when it is not in use, but what about the case where it is driving Displayport monitors and still isn't reported?
Had some time to try some alternatives. Short version is that it appears the Intel JHL6340 Thunderbolt 3 bridge can assume multiple states and HWiNFO presently only sees some of them.
First trial: Win 10 restart then run HWiNFO64 with no devices attached to the Thunderbolt 3 port. Low Level...
Report and Debug attached.
System is Razer Blade 15 Base. System is specified with one Thunderbolt 3 port which I believe requires a PCI 4x internal connection. I have a Thunderbolt 3 to dual DP display adapter attached to the Thunderbolt 3 port and both displays are working as expected. ...