Hi folks, apparently LXC is affected by a bug around apparmor support for months, see #1052934 and #1050256. The workaround is to set PrivateNetwork=false (set by default as a security measure) or to use a backports kernel.
AFAIU reason is a bug in 6.1. The fix (1cf26c3d2c4c) is not a one-liner, but reasonably small, and it has already been verified, so how comes it is still in the loop for weeks? Regards Harri