@raharper could you give the systemd in this ppa a test:
https://launchpad.net/~ddstreet/+archive/ubuntu/systemd

also, you're setting the MTUBytes via .link file, but that won't work
inside an lxd container as that setting only has any effect during udev
processing of interface 'add' uevent, which doesn't happen inside an lxd
container because 1) the interface already exists when the container
boots up and 2) systemd-udev-trigger.service has no effect (unlike bare
metal systems or vms) because unprivileged containers can't force uevent
generation by writing to sysfs uevent nodes.  Instead try adding a
[Link] section to the .network file with the MTUBytes; that will get
applied every time networkd starts.

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https://bugs.launchpad.net/bugs/1671951

Title:
  networkd should allow configuring IPV6 MTU

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