This is what my router (Starlink) says.
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It could be because this is a Pro and I had to update the kernel to add the Prolific driver for the SW EQ6 USB.
Of course connecting with 5GHz is fine when in range but Station mode doesn't appear to work at all, it doesn't show available AP's although I see them well enough on the Pi.
root@asiair:~# iwlist wlan0 scanning | grep Frequency
Frequency:2.437 GHz (Channel 6)
Frequency:2.437 GHz (Channel 6)
Frequency:2.437 GHz (Channel 6)
Frequency:5.785 GHz (Channel 157)
Frequency:5.785 GHz (Channel 157)
Frequency:5.785 GHz (Channel 157)
Frequency:2.437 GHz (Channel 6)
Frequency:2.437 GHz (Channel 6)