忘れてた。2.8.0にアップデートすると通知のどこまでが既読かという情報がリセットされるため、過去の通知がいっぺんに出てきますがバグではありません。

I understand Google's desire to shut out hate speech servers.
But instead of pressing the change by unclear policy violation, Google should take the initiative to maintain the server ban list, confront with public opinion, and enforce it to Chrome web browser.
These are not things the app author should do.
Especially maintaining the ban list is difficult for non-western residents.

If you have 4.2.0 or later, You can know the update without F-Droid. The updates will be shown on top of side menu and link to github release page also shown. you could get new APK from assets section in release page.