The website that I am currently on is hosted on Siteground and after running the SG Optimizer the previous message that was posted appeared.
It’s been situated since the original post.
It was a disabled plugin that left some remnants of itself that it was picking up.
To answer your question: What led you to think that it was related to WP Job Manager? A few things. Not being familiar with your plugin at the time. because it had worker assumed it was part of addon name. The plugin that you linked to, never came up in the research.
