iwx VHT unknown rate (type 3)

From: J.R. Oldroyd <fbsd_at_opal.com>
Date: Wed, 08 Apr 2026 20:53:02 UTC 
Seeing a lot of these messages in the log after a recent update.

+wlan0: link state changed to DOWN
+wlan0: ieee80211_node_get_txrate_dot11rate: called for VHT / unknown rate (type 3)!
+wlan0: ieee80211_node_get_txrate_dot11rate: called for VHT / unknown rate (type 3)!
+wlan0: link state changed to UP
+wlan0: ieee80211_node_get_txrate_dot11rate: called for VHT / unknown rate (type 3)!

Kernel is 16-cur of 2026/04/04.

Driver is iwx.  Occurs with multiple vendors' WiFi-6 and -7 A/Ps.

$ /sbin/ifconfig wlan0
wlan0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
	options=0
	ether c4:ff:99:xx:xx:xx
	groups: wlan
	ssid xxxx channel 40 (5200 MHz 11a vht/80-) bssid 28:87:ba:xx:xx:xx
	regdomain ETSI country FR authmode WPA2/802.11i privacy ON
	deftxkey UNDEF AES-CCM 2:128-bit AES-CCM ucast:128-bit txpower 23
	bmiss 10 mcastrate 6 mgmtrate 6 scanvalid 60 bgscan bgscanintvl 300
	bgscanidle 250 roam:rssi 7 roam:rate MCS 1 ampdulimit 64k
	-amsdutx amsdurx shortgi -stbc -ldpc -uapsd vht vht40 vht80 -vht160
	-vht80p80 wme roaming MANUAL
	parent interface: iwx0
	media: IEEE 802.11 Wireless Ethernet VHT mode 11ac
	status: associated
	nd6 options=829<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL,(null)>