Hi! I have the same issue on my website. This is something new that just started happening a week or 2 ago.
I always follow the same steps to paste the text without formatting and then I check the html and this <!– wp:paragraph {“imagePinMeta”:{}} –> gets added every time now.
Seeing that it says “pin” in it. @pghealy , Do you also use the Grow Social Plugin (formerly Social Pug)?
