Unable to invoke function when using "forge tunnel"

[Luong Manh Linh]

I'm trying to develop an application using forge.

However, there is a problem: When I use forge tunnel, whenever a function is called by using invoke("functionName", { } ), always this error:
Error: There was an error invoking the function - 404

But if I turn off forge tunnel, it works normally.

Forge version: 12.8.0