Facebook Sharer shows only link

Maybe my question is off-topic. If so, please delete.

Up to yesterday the facebook sharer showed the article title with link to the page, a thumbnail and an excerpt.
See here: https://www.followyou.ch/img/Sharer-old.png

Now the facebook sharer shows only a link to the page.
See here: https://www.followyou.ch/img/Sharer-new.png

I have modified nothing in the theme’s sharrre.php.

There are people writing that facebook had modified their sharer.php parameters.
Others say that sharer.php seems to pulling OG tags from the page. I tried OG plugins but nothing changed.

Does anyone have more information?