it would be interesting to know if any one else with this device has experienced the same.
It's nearly a year later, but:
Totally new install from Android->UBports using ubports-installer_0.9.7-beta, on a Pixel 2 (just 2), and there's no wifi device. I haven't yet tried a different version. I'm so new to this that I don't even know how to tell which OTA version I'm using; the installer was 0.9.7, and what ended up on the phone was kernel ubuntu-phablet-4.4.169-something under Ubuntu 16.04 (Xenial).
rfkill sees the bluetooth, but not the wifi.