Facebook - "Sorry, this content isn't available..." and other issues

Hello, for some time now, I've been experiencing weird things:

When I go to the page of a “friend,” I normally see the posts they shared in the form of
“Xxxx Yyyy shared a post”

But for the past few days, I only see
“Xxxx Yyyy”
Meaning that … “shared a post” doesn’t appear anymore!

If I go “live” to the page in question, I also don’t see the shared post, but only those that were published several days ago.
(maybe the same on all the pages I visit???)

And also:
If I receive a notification of a new post from a page I'm subscribed to... when I click on the notification, I get.
“Sorry, this content is currently unavailable.”

And, similarly to above:
If I go “live” to the page in question, I also don’t see the new post, but only those that have been published several days ago.

This happens with Firefox, Chrome, Opera, Edge… and on different machines
And a friend on MY machine has no issue on HIS account

So, no, I haven’t been blocked:
It happens with ALL my friends, and ALL the pages that notified me of a new post.

However, I still receive invitations to see a post, and I can access them normally.

Thank you for your help!
;-)