OK so I think I'm seeing something external to Juju causing this,
because I switched back to 2.3.8 and saw exactly the same symptoms.
AFAICT the bridging calls fail for some reason when bridging the VLAN
interface which is associated with the primary network interfaces -
start state:
eno1 (XX.YY.ZZ.AA)
eno1.2726 (YY.ZZ.AA.BB)
to
br-eno1 (XX.YY.ZZ.AA) -> eno1
br-eno1.2726 (YY.ZZ.AA.BB) -> eno1.2726
eno1.2726 disappears during the operation, leaving the bridge carrier-
less and nonfunctional.
Restarting systemd-networkd clears the issue and the interfaces are
created successfully.
Raising a netplan task for this bug.
** Also affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1784834
Title:
maas: incomplete bridge configuration for VLANs
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