Activity Stream shows hidden pages if there were not hidden in the past

Preconditions: create 2 simple users e.g. U1, U2

Steps to reproduce:

1. Log in with user U1
2. Create a normal XWiki page in any space e.g. Sandbox
3. Edit the page and tick the "Hidden page"
4. Press Save & View
5. Create and Publish a new blog post
6. Click on the lock next to the newly created blog post to Hide it from other users
7. Log in as U2
8. Observe the AS from the Dashboard

Expected results:
For step 2: The page appears in left navigation and in the AS from the Dashboard
For step 4: The page doesn't appear in the left navigation panel or in the AS from Dashboard
For step 5: The new blog post appears in left navigation and in the AS from the Dashboard
For step 6: The blog post doesn't appear in the left navigation panel or in the AS from Dashboard
For step 8: As U2 you can't see the hidden page and blog

Actual results:
For step 2: The page appears in left navigation and in the AS from the Dashboard
For step 4: The page doesn't appear in the left navigation panel but it still shows in the AS from Dashboard
For step 5: The new blog post appears in left navigation and in the AS from the Dashboard
For step 6: The blog post doesn't appear in the left navigation panel but it still shows in the AS from Dashboard
For step 8: As U2 you can see the hidden page and blog