Split tunneling an application breaks localhost loopback

[zznty]

Describe the bug
When application is added to "Split tunneling applications" list, windows could not resolve route to localhost (127.0.01) anymore, despite working fine without split tunneling via vpn

To Reproduce
Steps to reproduce the behavior:

1. Open source2 game (Deadlock in my case)
2. Add its exe to split tunneling list (project8.exe)
3. Try to start a sandbox
4. See the error above in console

Expected behavior
Application should be able to resolve route to localhost

Log files

[SteamNetSockets] WSASendTo 127.0.0.1:27015 failed, returned -1, last error=0x2741 The requested address is not valid in its context.

Desktop (please complete the following information):

• OS: Windows 11 24H2 (26100.2605)
• Version 4.8.1.9

Additional context
I think the case is valid for any application using win32 socket apis. Im not sure if this is caused by the fact that both socket listener and connecting socket are inside the same process.