Anyone else getting the "ai-optimize" p class tag in WordPress?

Been using WP for almost 9 years now and never seen this tag show up. I had text in Google drive and pasted into WP and the tag "ai-optimize" ended up in dozens of places throughout the text. Tried different browser, incognito mode, and copying text from a plain text editor instead of G drive. What gives? I don't use AI so don't know where this is coming from.