I made my first chat (fairly magic experience, fwiw, and very slick!) and noticed that the thumbnail looks like it’s being generated on the old Observable stack - it has the telltale play button in the top right, and it’s choking on a syntax error around the const keyword, so I’m guessing it’s expecting OJS.
You are correct. We have a new (serverless!) thumbnailer in development, but we haven’t transitioned to it yet, so until then thumbnails continue to be generated using old Observable.