If it helps, here are the Deco logs after disconnecting and connecting the bridge:
Thu Jun 13 10:47:23 2024 daemon.err client_mgmt: client(EC-B5-FA-30-D9-C0) disconnected
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: Found static lease: 3a44a8c0
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: Received DISCOVER
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: my ntp server ip:162 159 200 1 bee76e24
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: dhcp offer: add ntp server option
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: Sending OFFER of 192.168.68.58
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: Found static lease: 3a44a8c0
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: my ntp server ip:162 159 200 1 bee76e44
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: dhcp offer: add ntp server option
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: Sending ACK to 192.168.68.58
Thu Jun 13 10:47:28 2024 daemon.err udhcpd[13741]: clear ip 3a44a8c0
Thu Jun 13 10:47:28 2024 user.notice IMPROXY: INFO[imp_verify_multicast_addr@258]: Group address 239.255.255.250 belongs to IPv4 Local Scope.
Thu Jun 13 10:47:28 2024 user.notice IMPROXY: INFO[imp_verify_multicast_addr@245]: Group address 224.0.0.251 is Local Network Control Block
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: Get netlink MSG 100 size 52 from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCReadBufCB: Receive mdb updated event from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: Get netlink MSG 17 size 6708 from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 0 - 34:7E:5C:33:D1:EA, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 0, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 1 - 00:0E:58:A4:AE:0A, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 1, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 2 - 00:0E:58:C0:CD:E2, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 2, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 3 - B8:E9:37:37:EA:84, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 3, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 4 - 50:28:4A:FF:B0:E5, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 5 - 2C:4D:54:4B:85:EC, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 6 - 2C:4D:54:4B:85:EC, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 7 - 2C:4D:54:4B:85:EC, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 8 - 50:28:4A:FF:B0:E5, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Encap table is changed, update multicast encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Encap table is non-empty, update multicast encap table, entry count is 4, table size is 9312
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: Get netlink MSG 13 size 6740 from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 user.notice IMPROXY: INFO[imp_verify_multicast_addr@245]: Group address 224.0.0.251 is Local Network Control Block
Thu Jun 13 10:47:28 2024 user.notice IMPROXY: INFO[imp_verify_multicast_addr@258]: Group address 239.255.255.250 belongs to IPv4 Local Scope.
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: Get netlink MSG 100 size 52 from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCReadBufCB: Receive mdb updated event from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: Get netlink MSG 17 size 6708 from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 0 - 34:7E:5C:33:D1:EA, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 0, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 1 - 00:0E:58:A4:AE:0A, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 1, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 2 - 00:0E:58:C0:CD:E2, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 2, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 3 - B8:E9:37:37:EA:84, add it to flood table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Legacy node 3, update forwarding table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 4 - EC:B5:FA:30:D9:C0, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 5 - 50:28:4A:FF:B0:E5, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 6 - 2C:4D:54:4B:85:EC, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 7 - 2C:4D:54:4B:85:EC, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 8 - 2C:4D:54:4B:85:EC, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: vlan node 9 - 50:28:4A:FF:B0:E5, add it to encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Encap table is changed, update multicast encap table
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: mcManagerMCProcess: Encap table is non-empty, update multicast encap table, entry count is 4, table size is 9312
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: Get netlink MSG 13 size 6740 from br-lan
Thu Jun 13 10:47:28 2024 daemon.err imsnoop: ENTER mcManagerMCReadBufCB
Thu Jun 13 10:47:28 2024 user.notice IMPROXY: INFO[imp_verify_multicast_addr@258]: Group address 239.255.255.250 belongs to IPv4 Local Scope.
Thu Jun 13 10:47:29 2024 user.notice IMPROXY: INFO[imp_verify_multicast_addr@245]: Group address 224.0.0.251 is Local Network Control Block
Thu Jun 13 10:47:29 2024 user.notice IMPROXY: INFO[imp_verify_multicast_addr@245]: Group address 224.0.0.251 is Local Network Control Block