VLAN interface stuck in pending

[Matthias Luft]

Hi Friends,

I'm on Bullseye with 247.3-7+deb11u2 and am trying to configure a VLAN 
interface with networkd.

My configuration is listed below. VLAN interface gets created correctly, 
however, no IP gets assigned. If I assign an IP manually, the interface 
is functional. networkctl shows the interface as pending:

# networkctl
IDX LINK            TYPE     OPERATIONAL SETUP
   1 lo              loopback carrier     unmanaged
   2 wan             ether    carrier     configured
   3 isp_uplink_vlan vlan     degraded    pending


With debugging enabled, I see the following in the systemd-networkd journal:

isp_uplink_vlan: Interface is being renamed, pending initialization.
...
isp_uplink_vlan: link_check_ready(): link is in pending state.


Full log output listed here: https://pastebin.com/4urn8TBX


Would you have any pointers what I am missing here?

Thank you in advance & cheers,
Matthias

-----

Configuration:

# cat 01-wan.link
[Match]
MACAddress=99:xx:xx:xx:xx:xx

[Link]
Name=wan



# cat 05-vlan-default.netdev
[NetDev]
Name=isp_uplink_vlan
Kind=vlan

[VLAN]
Id=7


# cat 10-wan-baseif.network
[Match]
MACAddress=99:xx:xx:xx:xx:xx
Type=ether

[Network]
Description=Base WAN interface

VLAN=isp_uplink_vlan

DHCP=false
LinkLocalAddressing=no
LLDP=no
EmitLLDP=no
IPv6AcceptRA=no
IPv6SendRA=no


# cat 11-public-vlan.network
[Match]
Name=isp_uplink_vlan

[Network]
Description=ISP Uplink

[Link]
ActivationPolicy=up

[Address]
Address=192.168.5.22/24