Exception during start of Python Azure Function not logged or found

Question

We have a small Python Azure Function like this :

import azure.functions as func
import logging
import zsbiconfig
app = func.FunctionApp()
@app.timer_trigger(schedule="0 */1 * * * *", arg_name="myTimer", run_on_startup=False,
                   use_monitor=False)
def zsdbi(myTimer: func.TimerRequest) -> None:
    if myTimer.past_due:
        logging.info('The timer is past due!')
    logging.info('21 Python timer trigger function executed.')
    return

If during load a Exception is thrown eg. import zsbiconfig not found I do not find this Information in the azure Portal or elsewhere. We do see however the logging calls in the LogStream but no Exception.