System is TrueNAS SCALE Dragonfish-24.04.0
I’m not very expert on this. But it seems like when adding interfaces to network bridges (I was configuring the default br0 in this case,) the configurator will not set the master of the interface to the bridge.
For example, if I want to add eth0 to br0, after adding eth0 to br0 on the configuration page, eth0 will still be down. To make it work properly, I had to execute
ip link set eth0 master br0
ifconfig eth0 up
Then everything will work properly.