I have since learned that it shows up whenever anyone else visits my sites. Yesterday, I disabled the plugin. Today it has turned itself back on.
My understanding of AMP is that it is not nearly as wonderful as Google might want you to believe. I believe Weaver’s mobile support is plenty adequate for phones and tablets, and really doesn’t need any tiny help AMP might provide.
I had tested the earlier versions of AMP plugins (two or three years ago), and they didn’t break Weaver Xtreme then. Don’t know about now.