Access port for tagged VLAN just doesn't work for vlan aware bridge

I am on my whits end. I have a config which identically works on a different machine (different board, CPU, network adapter though): auto eno1 iface eno1 inet manual auto vmbr0 iface vmbr0 inet manual bridge-ports eno1 bridge-stp off bridge-fd 0 bridge-vlan-aware yes bridge-vids 1-4096 bridge-pvid 1 auto vmbr0.1 iface vmbr0.1 inet static address 10.227.1.21/24 gateway 10.227.1.254 iface vmbr0.4 inet static address 10.227.4.67/24 Network interface eno1 is connected to a managed switch with trunk access port, VLAN4 tagged and VLAN1 untagged. In above configuration, **vmbr0.1 works and vmbr0.4 does not work**: I cannot reach any other host on the same VALN4. If I run tcpdump on vmbr0.4, I can only see ARP requests being sent out but nothing received. Now, on this, I could expect all VLANs so something seems wrong: # bridge vlan show port vlan-id eno1 1 PVID Egress Untagged vmbr0 1 4 The exact identical config works on another PC with the same managed switch port (but using enp3s0 and enp4s0 as bridge-ports instead). VLAN per se are working: If I remove the VLAN aware bridge but instead configure eno1.1 and eno1.4, everything works as expected too! In case it matters, it's a I219-LM network adapter in a HP Elitedesk 800 G mini PC. It uses e1000e driver. What the heck can possibly be wrong here?