previews from https://alexandr-rogers.livejournal.com almost always are generated and work, but sometimes they are missing, looks like they failed to generate (example: https://t.me/rogers_kitchen/17165 and the article to be previewed is https://alexandr-rogers.livejournal.com/1908934.html). I think it has to do with youtube videos that almost always are present in those articles without "preview" button, but also there are some of his posts *with* youtube videos and they still have preview.