BlogPostClass - Object not found when creating blog posts in a multi-language wiki

When creating several blog posts, at some time the new created blogs are displayed with "[blogname] is not a blogpost." (see in the pucture blog entry 4, which was ok and 2 & 3which failed)

What I identified is, that there is no BlogPostClass Object assosiated with the page.

This occurs not always and might work again, when the browser is changed.

Whean adding a BlogPostClass object, the pages is displayed as a blog (see blog entry 1)  but the contents is gone.