I came across this problem (again) today and a google search brought me to a post in this thread, ironically one I posted myself a few months ago - I had forgotten I had had this problem before, on another machine!For anyone like me who finds this thread and can't get the community script, it's been moved to a URL which is almost but not quite exactly the same as the one posted several times. I'll try to paste it here, but in case this forum restricts links from new users you can take the link that's been posted several times and remove the capital D.
https://community-scripts.github.io/ProxmoxVE/scripts?id=nic-offloading-fix
Thanks for pointing out the correct script.
Unfortunately running it a second time doesn't seem to toggle the feature back off, but since it's been going on for years I suspect that won't matter.