Lifespan task called multiple times when using Docker

[luator]

I'm using a lifespan task to do some initialisation stuff when starting the application (e.g. loading a config file and things like that). The code looks like that:

def init():
    ...

app = rx.App()
app.add_page(...)
...

app.register_lifespan_task(init)

When running reflex locally, this results in the init function to be executed once in the beginning, just as I expect (prints added to the function show up once). However, when running in a Docker setup (based on the production-compose example, the function get's called 25 times, apparently in parallel (prints appear multiple times and are intermingled).

Why is it called multiple times in the docker container? How can I avoid that?