sourceline

Yes, I see script errors in wp-seo-post=scraper and it breaks the visual/text tabs on the classic editor and Yoast input won’t display in WordPress Post Edit. Fixes if deactivate yoast.

Doesn’t happen on all sites, so not sure if there is a conflict with another plugin or not. I’m looking through some other sites and will update if I find anything.

I’ve found that this code was inserted by a chrome extension. Check your chrome extensions, especially anything you use for RSS automation or submitting links to websites.