OnClientFullyConnect listener doesn't trigger (TF2 on Linux)

Title.

Verified with this snippet on TF2 + Linux:

```python
from core import echo_console
from listeners import OnClientConnect, OnClientFullyConnect

@OnClientConnect
def report_connect(*args):
  echo_console("connected")

@OnClientFullyConnect
def report_fullyconnect(index):
  echo_console("fully connected")
```

`connected` is displayed, but no `fully connected`.
