This is a reproducible issue. Changes to VLAN description cause all interfaces to flap. I have the system.log file to show. Below is the snippet. Whatever the issue is here is most likly the reason why if you attempt to change network ports in the GUI, changes are not reflected in the GUI. If you make a change to the config.xml then changes are reflected in the GUI.
Feb 5 18:46:49 GA-FW1 kernel: igc2: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: igc3: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: lagg0: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: lagg0.3: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: lagg0.23: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: lagg0.11: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: lagg0.14: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: lagg0.15: link state changed to DOWN
Feb 5 18:46:49 GA-FW1 kernel: vlan4: changing name to 'lagg0.17'
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting igc2
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting igc3
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting lagg0
Feb 5 18:46:49 GA-FW1 tailscaled63392: 2023/02/05 18:46:49 magicsock: endpoints changed: 162.193.210.96:41641 (stun), 10.6.106.1:41641 (local), 10.32.112.190:41641 (local), 172.26.0.1:41641 (local), 172.28.0.2:41641 (local), 172.29.0.1:41641 (local), 192.168.3.1:41641 (local), 192.168.3.5:41641 (local), 192.168.11.254:41641 (local), 192.168.14.254:41641 (local), 192.168.15.1:41641 (local), 192.168.15.40:41641 (local), 192.168.15.77:41641 (local), 192.168.15.222:41641 (local), 192.168.15.241:41641 (local), 192.168.23.254:41641 (local), 192.168.50.100:41641 (local), 192.168.50.254:41641 (local)
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting lagg0.3
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting lagg0.23
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting lagg0.11
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting lagg0.14
Feb 5 18:46:49 GA-FW1 check_reload_status423: Linkup starting lagg0.15
Feb 5 18:46:49 GA-FW1 php-fpm82172: /interfaces_vlan_edit.php: Gateway, NONE AVAILABLE