I don't know. I can't reproduce the error, it just works when I click it.
It is strange however, that this number 9056 has been given by the Wordpress. Usually it is the title of the post.
Your link leads me to a Wordpress login page. To reproduce, try deleting your cookies (or try another browser).
Specifically, your link resolves to this: https://wordpress.com/wp-login.php?redirect_to=https%3A%2F%2Fwordpress.com%2Fpost%2Fprotokol2020.wordpress.com%2F9056
Is that -- https://protokol2020.wordpress.com/2017/04/02/another-intermezzo-intermezzo-problem/ -- the link you mean?
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should start on Monday, and end on Sunday.
4. Unflag the two options "Notify me of new top level comments on this article" and "