Here's the patch ...
diff --git a/src/PVE/LXC/Setup/Base.pm b/src/PVE/LXC/Setup/Base.pm
--- a/src/PVE/LXC/Setup/Base.pm
+++ b/src/PVE/LXC/Setup/Base.pm
@@ -267,6 +267,7 @@ sub setup_systemd_networkd { if (defined(my $ip = $d->{ip6})) {
if ($ip eq 'dhcp') {
$dhcp |=...