[Python] Can't terminate a FastAPI app that is using websockets

I have a FastAPI app with several HTTP routers and I added a simple websocket route like this:

@router.websocket("/chat/{room_id}/")
async def websocket_execute(
websocket: WebSocket,
) -> None:
await websocket.accept()
try:
while True:
data = await websocket.receive_text()
except WebSocketDisconnect:
...


It is working, but if I have an active connection and try to stop the app using ctrl + C, this doesn't work. Only sigkill 9 works for stopping the app. For another HTTP router it is working properly.

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