JobServer strange process step

 Hi everyone,

Lately while checking the logs of my job server I've noticed this strange process step that keeps appearing :

 

Does anyone knows what this means?

FYI, this process step appears hundreds of times, as if it was in an infinite loop.

What worries me the most is the message "Process step uuid not found. Set MISSING state". I can't figure out what this message means.

Furthermore, this is causing the jobs in the job queue to take an eternity to execute.

Thank you in advance for your help.

Regards.