Omg, I think I might have done it. Doing the following updated igc to a newer version and fixed my need to replug the cable on startup, but I haven’t verified whether it fixed the virtual machines. Here’s what I did:I don't know if that's possible.
1. Reinstalled Proxmox in frustration after mucking up my first install.
apt install sudo
echo “deb http://download.proxmox.com/debian/pve buster pve-no-subscription” > /etc/apt/sources.list
apt update
sudo apt-get install git
sudo apt-get install pve-headers-$(uname -r)
sudo apt-get install dkms
git clone https://github.com/jksinton/intel-igc.git
cd intel-igc
git checkout dev
./install.sh
reboot
LMK if this fixes the VM issue for you! I’ll test it in a few hours once I reset all 300,000 config settings I had before.