Your messages to them show as sent but never show as delivered (if you previously saw delivery/read indicators).
Their profile photo or cover photo no longer appears to you.
Their posts, stories, and reactions no longer show up in your feed.
Their account name doesn’t appear in Facebook search results when you search while logged in.
You can’t view their profile page directly (even via a link you had saved).
The “Add Friend” button appears instead of their usual friend status (or you can’t see the “Friends” indicator).
Your mutual friends can still see their profile and content, but you cannot.
You can still see their content in group chats, but only if the content is visible in that context.
Their Messenger chat thread disappears or you can’t find their conversation in Messenger.
Your calls or video calls to them in Messenger fail to connect (this can also happen for other reasons).
Their profile loads only partially or shows limited content when viewed from your account.