why my Xcode organizer can not show Hangs

in instrument we can see in cellular network ，Every network request establishes a TCP connection. but in WiFi network，Only the first network request will establish a TCP connection, subsequent requests will not. This seriously affects the performance of our network requests, so why is it like this? WiFi network： cellular network：

After iOS16.1, a large number of network flashbacks occurred. but On March 20th, the quantity suddenly decreased，I haven't found the reason yet