Nextcloud Docker Container - best way to run cron job

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I use this now

  cron:
    image: nextcloud
    container_name: nextcloud-cron
    restart: unless-stopped
    depends_on:
      - app
#    env_file:
#      - ./nextcloud.env
#      - ./db.env
    volumes:
      - type: volume
        source: nextcloud_app.persistent
        target: /var/www/html
        read_only: false
      - type: volume
        source: nextcloud_data.persistent
        target: /var/www/html/data
        read_only: false
    entrypoint: /cron.sh

(Had to comment out the .env files, since I don’t have them). It starts fine, the logs of nextcloud-cron says:

nextcloud-cron
crond: crond (busybox 1.35.0) started, log level 0
crond: user:www-data entry:(null)
100001000010000100001000010000100001000010000100001000010000
111111111111111111111111
11111111111111111111111111111111
111111111111
1111111
crond: crond (busybox 1.35.0) started, log level 0
crond: user:www-data entry:(null)
100001000010000100001000010000100001000010000100001000010000
111111111111111111111111
11111111111111111111111111111111
111111111111
1111111
crond: user:www-data entry:(null)
100001000010000100001000010000100001000010000100001000010000
111111111111111111111111
11111111111111111111111111111111
111111111111
1111111
crond: wakeup dt=18
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=60
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=60
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=60
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond:  job: 0 php -f /var/www/html/cron.php
crond: child running /bin/bash
crond: USER www-data pid  13 cmd php -f /var/www/html/cron.php
crond: wakeup dt=10
crond: crond (busybox 1.35.0) started, log level 0
crond: user:www-data entry:(null)
100001000010000100001000010000100001000010000100001000010000
111111111111111111111111
11111111111111111111111111111111
111111111111
1111111
crond: user:www-data entry:(null)
100001000010000100001000010000100001000010000100001000010000
111111111111111111111111
11111111111111111111111111111111
111111111111
1111111
crond: wakeup dt=50
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=60
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=60
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=60
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond:  job: 0 php -f /var/www/html/cron.php
crond: child running /bin/bash
crond: USER www-data pid  12 cmd php -f /var/www/html/cron.php
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: file www-data:
crond:  line php -f /var/www/html/cron.php
crond:  job: 12 php -f /var/www/html/cron.php
crond: user www-data: process already running: php -f /var/www/html/cron.php
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: wakeup dt=10
crond: crond (busybox 1.35.0) started, log level 0
crond: user:www-data entry:(null)
100001000010000100001000010000100001000010000100001000010000
111111111111111111111111
11111111111111111111111111111111
111111111111
1111111
crond: user:www-data entry:(null)
100001000010000100001000010000100001000010000100001000010000
111111111111111111111111
11111111111111111111111111111111
111111111111
1111111
crond: wakeup dt=4
crond: file www-data:
crond:  line php -f /var/www/html/cron.php

But when checking the issues as admin on the nextcloud instance it says there’s an error with cron and it hasn’t been run for many days. I have selected cron as the service to run background jobs with. How can I trouble shoot?