Usb3 port on Hap ax3 and quectel rm520nglaa

hello,
i’m using a modem rm520nglaa with an adapter m.2 to eth/usb3 from waveshare, connected to a hap ax3 by usb port, but if i check resources->usb on router os 7.15 i see the modem using usb 2 at 480mbps.
If i plug the same cable and adapter in a windows pc i see the same adapter working in usb3 at 5gbps.
On routeros I plugged it and configure apn and noting more (about at command etc), and it works.
i don’t know why hap ax3 has this usb port declared 3.0 that works in 2.0.
What can i check?
thanks