Not personally no but it might be a staff member did. But it was fine before migrating to the staging server. After the move, the issue in titles (only place that shows up) is the problem. We had a different theme.
Retyping (removing) the error does fix it, unfortunately we are talking over 200 posts.
Putting that back in helped. I did lose some settings in the Customizer like the footer credits but that is easy to put back.
Thought I would share that in case anyone else comes across that. The webhost had done a file edit to comment something out and must have been accidentally deleted perhaps.