[Python] Python Azure Function doesn't show functions after importing packages

I have an Azure Function based on Python 3.12 (same issue when I downgrade to Python 3.11). This worked fine until I imported azure.identity and azure.keyvault.secrets. Since I've added them the functions are not shown anymore in my Azure Function. When I remove them the functions will be back. It is fine when the package is loaded from the requirements.txt. The issue just happens when I add

from azure.keyvault.secrets import SecretClient
from azure.identity import DefaultAzureCredential


What can be the issue what leads to that?

Project Structure

function_app.py

import azure.functions as func
from http_blueprint import bp_http
from timer_blueprint import bp_timer

app = func.FunctionApp()

app.register_functions(bp_http)
app.register_functions(bp_timer)


http_blueprint.py

import logging
import azure.functions as func

bp_http = func.Blueprint()

@bp_http.route(route="default_template")
def default_template(req: func.HttpRequest) -> func.HttpResponse:
...


timer_blueprint.py

import os
import requests
import logging
import datetime
import azure.functions as func
from azure.keyvault.secrets import SecretClient
from azure.identity import DefaultAzureCredential

#same issue when libaries would be imported like this
#import azure.identity
#import azure.keyvault.secrets

bp_timer = func.Blueprint()

@bp_timer.timer_trigger(schedule="0 * * * * *",
arg_name="mytimer",
run_on_startup=True)
def exec_timer(mytimer: func.TimerRequest) -> None:
...

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