Fern will discover the group of APs that I can see with airodump-ng wlan0, about 40. It then discovers 40 more, then 40 more, and keeps going into the thousands.
Kali-Linux is running on VirtualBox on a Windows 11 Host.
USB Wireless adapter is RTL8814AU 802.11a/b/g/n/ac.
This may be a clue. When I change the adapter in to monitor mode, it does not rename it to wlan0mod. I have to rename it manually if order for Fern to see it.