i3status Wifi bitrate shows very low speed, intermittently

i3status shows a very low bitrate (on 5GHz it can range from 6.5 Mb to 19.5 Mb, on 2.4 it can get as low as 1 Mb) with wifi's %bitrate variable.
iwlist [interface] bitrate returns the correct connection speed (e.g., 270 Mb).
Given I'm using iw, the Wifi card is an Intel.
Wifi is handled by NetworkManager, running under Arch.

Format for the wireless block is:

wireless wlp3s0 {
format_up = "W: (%quality at %essid, %bitrate) %ip"
format_down = "W: down"
}

The base station has already been restored to factory settings, issue persists.
I also observed similar behavior on another Arch machine, connected at 2.4 GHz.

dhclient was updated in the last couple of days but I don't use it, shouldn't have to do with it, but mentioning it anyway.

Versions of i3 running: i3-gaps-git, i3status-git, installed via AUR

Per airblader's suggestion, the issue might lie with the switch from libiw to libnl.