Yesterday I upgraded my laptop to Windows Insider preview:
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OS Name: Microsoft Windows 10 Home
OS Version: 10.0.21370 N/A Build 21370
After that, every guest I have installed showed empty drop-down network interface list and the VMs would not start due to its missing.
The easiest test was to downgrade VirtualBox. I had 6.1.18 kit downloaded, which now works fine. This points to a regression in 6.1.22 which exhibits itself under the latest Windows 10 update (as I would not think the release has been done without testing on the released versions...).
I haven't tested yet 6.1.22 on a different Windows 10 version (I have no other suitable hardware at the moment).