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Cannot capture unicast WLAN packets from any station

I am trying to sniff regular data frames over WLAN with Wireshark, but am unable to capture ANY unicast frames at all.

I have created a monitor mode virtual interface (mon0) of my WLAN interface using the iw command. I get broadcast/multicast packets, as well as a ton of management/control frames, but no unicast packets, not even from the capture PC that I am running Wireshark from, let alone from any other WLAN devices on the network.

I am running Arch Linux (Linux 5.0.10) using a TP-Link WLAN adapter with a Qualcomm Atheros AR9287 chipset. I would be grateful if anyone could suggest a reason why this is not working properly?