Hi
Some time ago I bought LtAP LTE kit (or 4g I don’t remember) and I’m using additional pci-e R11e 2ghz to use 2.4 ghz as both station (to IoT devices in car) and AP (for laptops, phones etc).
According to this diagram:

USB should be mutually exclusive with pci-e slot. But today I actually connected gigabit dongle to USB port and it just works. I have USB-type set to “USB-type-A” but at the same time secondary wifi card works just fine.
Does it mean R11e works now in some USB fallback mode? Are there some drawbacks of this approach?