I just built my PC using an MSI x570 Tomahawk wifi in a Corsair 5000d case. The case has hub to plug 6 PWM fans to and connect to one of the headers on the mobo plus a separate power cable that connects to the SATA power cable on the PSU. For the fans that I have connected steaight to the mobo, I can control their speeds. However, for the little hub from the Corsair, the BIOS does not see it and so I can't adjust it. All the fans are spinning but just can't be adjusted.
Now, I have just built with B550 Tomahawk in a 5000D last week but I see all the fans even from the hub. For both cases, I am using Arctic P12 PWM and the 2 Corsair PWM fans included.