Using Tor bridges for censorship circumvention routes your traffic to a bridge before an entry node. If the IP of the bridge is constant, isn't it abnormal that you are always connecting to the same IP and thus allow an ISP to know that you are using Tor through a bridge?
Some pluggable transports such as meek-azure route your traffic to a Microsoft website before an entry node, isn't it abnormal that an internet user is always browsing a Microsoft website without browsing other websites and thus allow an ISP to know that you are using Tor through a pluggable transport?
How does Tor bridges prevent an ISP from knowing that someone is using Tor? I would be glad if someone can explain it using a simple diagram.