I have this exact same error on one of the three sites I am hosting in a multi-site set up which leads me to believe one of the settings I have in that site is making this happen. I have not yet determined which setting but when I track it down I will circle back and update the post, I just wanted to add that I am also seeing this in the wild on the latest tests-passed release.
This is what is in my console and it is all things I am used to seeing for better or worse 
