Netplan配置VLAN DHCP无法为enp3s0.108分配IP地址的问题排查求助

各位好，我遇到了一个Netplan配置的问题，想请大家帮忙排查一下：

我的设备是Ubuntu系统，作为KVM宿主机使用，配置了两个物理网卡enp2s0和enp3s0，所有网络通信都需要绑定到VLAN上，同时还定义了一个网桥br0。

以下是我的Netplan配置文件内容：

network:
  version: 2
  renderer: networkd
  ethernets:
    enp2s0:
      # MAC: 00:01:2e:93:a9:88
      dhcp4: false
      dhcp6: false
      wakeonlan: true
    enp3s0:
      # MAC: 00:01:2e:93:a9:89
      dhcp4: false
      dhcp6: false
      wakeonlan: true
  bridges:
    br0:
      # MAC: ca:b7:f8:5e:99:a4
      dhcp4: false
      dhcp6: false
      interfaces: [enp3s0.108]
  vlans:
    enp2s0.110:
      # MAC: 00:01:2e:93:a9:88
      id: 110
      link: enp2s0
      dhcp4: true
      dhcp4-overrides:
        send-hostname: true
        route-metric: 100
        use-routes: false
      dhcp6: true
      dhcp6-overrides:
        send-hostname: true
        route-metric: 100
        use-routes: false
      accept-ra: true
      routes:
        - to: default
          via: 192.168.110.1
          metric: 100
        - to: default
          via: "fe80::2a0:57ff:fe54:ec96"
          metric: 100
          table: 100
      routing-policy:
        - from: 192.168.110.8/24
    enp3s0.108:
      # MAC: 00:01:2e:93:a9:89
      id: 108
      link: enp3s0
      dhcp4: true
      dhcp4-overrides:
        hostname: f42252v8
        use-routes: false
      dhcp6: true
      dhcp6-overrides:
        hostname: f42252v8
        use-routes: false
      accept-ra: true
      routes:
        - to: default
          via: 192.168.108.1
          metric: 200
          table: 200
        - to: default
          via: "fe80::2a0:57ff:fe54:ec96"
          metric: 200
          table: 200
      routing-policy:
        - from: 192.168.108.8/24

现在出现的问题是：enp3s0.108没有被分配到IP地址，但是我查看DHCP服务器时，发现已经给这个VLAN对应的MAC地址（00:01:2e:93:a9:89）分配了IP。

另外，运行netplan status --all时会出现一堆警告，并且输出里enp3s0.108没有显示IP地址，具体输出如下：

WARNING:root:Unknown device type: vlan
WARNING:root:Unknown device type: vlan
WARNING:root:Unknown device type: vlan
WARNING:root:Unknown device type: vlan
WARNING:root:Unknown device type: vlan
WARNING:root:Unknown device type: vlan
Online state: online
DNS Addresses: 127.0.0.1
●  1: lo ethernet UNKNOWN/UP (unmanaged)
MAC Address: 00:00:00:00:00:00
Addresses: 127.0.0.1/8
           ::1/128
Routes: ::1 metric 256
●  2: enp2s0 ethernet UP (networkd: enp2s0)
MAC Address: 00:01:2e:93:a9:88 (Realtek Semiconductor Co., Ltd.)
Addresses: fe80::201:2eff:fe93:a988/64 (link)
Routes: fe80::/64 metric 256
●  3: enp3s0 ethernet UP (networkd: enp3s0)
MAC Address: 00:01:2e:93:a9:89 (Realtek Semiconductor Co., Ltd.)
●  4: wlp1s0 wifi/"(null)" DOWN (unmanaged)
MAC Address: 48:89:e7:db:ec:d2 (Intel Corporation)
●  5: br0 bridge UP (networkd: br0)
MAC Address: ca:b7:f8:5e:99:a4
Addresses: fe80::c8b7:f8ff:fe5e:99a4/64 (link)
Routes: ...:1302::/64 metric 1024 (ra)
        ...:1300::/56 via fe80::2a0:57ff:fe54:ec96 metric 1024 (ra)
        fe80::/64 metric 256
        default via fe80::2a0:57ff:fe54:ec96 metric 1024 (ra)
●  6: enp2s0.110 other UP (networkd: enp2s0.110)
MAC Address: 00:01:2e:93:a9:88
Addresses: 192.168.110.8/24 (dhcp)
           ...:1301::8/128
           fe80::201:2eff:fe93:a988/64 (link)
DNS Addresses: 192.168.110.1
               192.168.110.8
               fe80::2a0:57ff:fe54:ec96
DNS Search: averlon.loc
Routes: default via 192.168.110.1 metric 100 (static)
        192.168.110.0/24 from 192.168.110.8 metric 100 (link)
        192.168.110.1 from 192.168.110.8 metric 100 (dhcp, link)
        192.168.110.8 from 192.168.110.8 metric 100 (dhcp, host)
        ...:1301::/64 metric 100 (ra)
        ...:1300::/56 via fe80::2a0:57ff:fe54:ec96 metric 100 (ra)
        fe80::/64 metric 256
        default via fe80::2a0:57ff:fe54:ec96 metric 100 (ra)
●  7: enp3s0.108 other UP (networkd: enp3s0.108)
MAC Address: 00:01:2e:93:a9:89
● 10: vnet2 ethernet UNKNOWN/UP (unmanaged)
MAC Address: fe:54:00:a4:86:c4
Addresses: fe80::fc54:ff:fea4:86c4/64 (link)
Routes: fe80::/64 metric 256

我不确定哪里配置出错了，希望各位能给我一些排查的提示，谢谢大家！

备注：内容来源于stack exchange，提问作者averlon