Page Not Found, when I am trying to open any snippet

I see all my snippets on the project snippet page, but I can't open them. These snippets connected with the Drupal 8 tricks project. I have tried to change permissions for this project, but it doesn't help, instead, some snippets disappeared. So I changed permissions back. I had 9 snippets, but now, I see only 6, and unable to open them.