External Cronjob seems to be cached

Hey there. First of all, thank you for this great plugin! I have a problem with the cronjob. I have WP_CRON deactivated and using an external cron. I call the website with a script. But no matter if I call it with a script or in my browser a second time, the cronjob is not recognized.

I mean the website respondes with OK and status code 200 but in the affiliate toolkit dashboard the last cronjob executions stays at the same time like e.g. 7 minutes.

I’m using Redis as object cache and also define('WP_CACHE', true); And I’m using WP Rocket as well.

After clearing the object cache I can call the URL from the same browser it didn’t work before and then it also updates the last cronjob execution. Do I need to exclude something specifically or what is going on?