Updated list of router which support "Monitor Mode"

I have a AX1800 here and I’m having some issues with getting packets in in monitor mode. Instructions have been followed as above.

Firmware is 4.2.1, so up to date.

After installing airmon-ng, I’m asked to get lsusb.

root@GL-AXT1800:~# airmon-ng
Please install lsusb from your distro's package manager.
root@GL-AXT1800:~#

This is sorted with:
opkg install usbutils

I run
airmon-ng check kill

I start wlan1 (2.4GHz) in monitor mode:

root@GL-AXT1800:~# airmon-ng

PHY     Interface       Driver          Chipset

phy0    wlan0           ath11k          Not pci, usb, or sdio
phy1    wlan1           ath11k          Not pci, usb, or sdio

root@GL-AXT1800:~# airmon-ng start wlan1 1

Found 3 processes that could cause trouble.
Kill them using 'airmon-ng check kill' before putting
the card in monitor mode, they will interfere by changing channels
and sometimes putting the interface back in managed mode

 3644 root      5132 S    /usr/sbin/wpa_supplicant -n -s -g /var/run/wpa_supplicant/global
 4567 root      1172 S    udhcpc -p /var/run/udhcpc-eth0.pid -s /lib/netifd/dhcp.script -f -t 0 -i eth0 -x hostname:GL-AXT1800
 4701 nobody    1916 S    avahi-daemon: running [GL-AXT1800.local]
30588 root      1240 R    grep wpa_action\|wpa_supplicant\|wpa_cli\|dhclient\|ifplugd\|dhcdbd\|dhcpcd\|udhcpc\|NetworkManager\

PHY     Interface       Driver          Chipset

phy0    wlan0           ath11k          Not pci, usb, or sdio
phy1    wlan1           ath11k          Not pci, usb, or sdio

                (mac80211 monitor mode vif enabled for [phy1]wlan1 on [phy1]wlan1mon)
                (mac80211 station mode vif disabled for [phy1]wlan1)

root@GL-AXT1800:~#

I start airodump-ng - there are at least 10 APs and lots of clients on channel 1 round here:
airodump-ng --channel 1 wlan1mon

And I get something in airodump-ng, but not what is happening:

Any ideas?