It is due to the way that EE3 was created. Events are shown dynamically on the page, so a single event is still using the main events page (events_details in this case).
This was one of the many reasons why in EE4 we made events into true custom post types.
Currently in EE3, the only way to share it via Facebook, would be to edit the event and create a Post as well, then share the post.
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