Can`t receive upnp or mdns notify when i turn on system hotspot in windows11,but in windows10 it`s worked

Question

In windows 11 ,I start a console application .net socket which i can receive upnp or mdns broadcast message to know what device is in my net,but when i turn on my system hotspot and use my mobile to connect my hotspot,I cant receive upnp or mdns broadcast message. this would not happen in window10.And when i reconnect wifi .i can receive message again. I want to know:

First:

What`s the different between win10 and win11 in systemhotspot

Second:

What cause this problem,and how can i fix this Here is the console i use:

https://github.com/tmds/Tmds.MDns
You can test like this:

1.Run the console
2.Open System hotspot(I can receive upnp/mdns message)
3.use mobile phone to connect hotspot

4.Restart the console (then it cant receive upnp/mdns message)

5.Reconnect wifi(it can receive upnp/mdns again)