Update, solved with the kernel upgrade. I can confirm that on the z490 series chipset the version of igc just drops packets. I didn't take the time to bisect what patch works to resolve the issue fwiw I just turned it straight to 11.
This is what I'm working with now, i'd like to go back to using dhcp if possible as well.
# cat /etc/network/interfaces
# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
# If you want to manage parts of the network...
tl;dr same config on different machines, different results. How to debug?
This is all with a fresh install of 6.3 downloaded today. I've installed on a Aorus Pro AX Z490 board and am using the onboard NIC.
After install I set the net interface to DHCP
iface vmbr0 inet dhcp...