Interesting ethernet link status / state issue

Hi,

Here's one I've never seen before:

https://www.klos.com/~john/badlink.jpg

The important bits are:

ifconfig genet0, status shows no carrier
ifconfig genet0 down
ifconfig genet0, staus shows active, media shows 1000baseT

This is a Raspberry Pi 400 running NetBSD 10.0_RC1 from 30-November-2023 
sources plugged directly in to an Arris / Nokia BGW320-500 NAT router / 
wifi / fiber ONT device. This device has tons of issues, so I haven't so 
far been surprised when devices sometimes don't come up after reboot.

I also had issues with a NanoPi Neo's ethernet and switched to a USB cdce* 
ethernet, which made things work only slightly better, but I had no local 
serial console, so I didn't diagnose this before.

Leaving "media autoselect" out of ifconfig.* seems to make things work 
better, and at very least doesn't lead to what happened above. Note that 
I've only tried restarting after removing that a few times, and the 
machines and network are not close to where I am.

Thoughts?

John Klos