You have a couple options here. I think simplest would be to just add:
bridges:
br0:
interfaces: [vlan1]
to your netplan config. This will generate
/run/systemd/network/10-netplan-vlan1.network with:
[Match]
Name=vlan1
[Network]
LinkLocalAddressing=no
ConfigureWithoutCarrier=yes
Bridge=br0
so the master will be configured correctly. Otherwise, you could add a
drop-in configuration for vlan1 to set KeepMaster=true (I don't know if
netplan has something for this)[1].
Either way, I do not think this is a bug.
[1]
https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#KeepMaster=
** Changed in: systemd (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2036127
Title:
Restarting `systemd-networkd` looses unmanaged bridged parents
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