WidgetSharePreview stopped parsing shared page details, what could be the problem?

Question

Classmates

On September 23, the details of the shared page were no longer parsed - now only the link is published when sharing.
Initially, there was a share block from Yandex, there were no og meta tags on the page.
After the problem arose, we tried to change sharers from other designers, set the "Native" share from Odnoklassniki, added meta tags to the og site. There are no shifts.
Around the same period, problems with the server were noticed, with which this problem was also associated, now there are no problems - the ball is still not working.
We checked the same method of sharing on other resources: everything works with a bang.