nice - if it indeed fixes the issue for this kind of system - could I ask you to drop a comment in:with that workarounding the issue is very easy!
https://bugzilla.proxmox.com/show_bug.cgi?id=3729
and saying that this works in your case
(also mentioning this thread here)
I'll try to address this soon - so hopefully the next ISO will contain this (no promises though)
Thanks!