Who knows why IOS can not access any network after using WiFi and cellular data connection?

[bbhxwl]

Who knows why IOS can not access any network after using WiFi and cellular data connection?
The real problem

After Apple turned off KVC FD of nepacketflow on IOS 18+, libboxgettunnelfiledescriptor() can still scan the real utun FD (confirmed in our log
utun7), But this FD direct read() will never get the packet - the system will only push the packet to the packetflow. Readpackets() callback of objc.

So the status quo:
-Sing box holds utun7 FD in syscall read. Read is always hung, traffic=0
-The urltest (HTTP client → outbound socket → proxy server inside the sing box) works instead, so "it seems verified"
-Packets sent by the user app → the system sends them to utun7 according to the route of includeallnetworks → the sing box cannot read → all are lost