Unable to complete unique essence map

Hi GGG,

I recently ran a map called "The Silent Cave". Its a unique essence boss map.

During my run, I popped all smaller essences, killed them, pop middle boss essence, killed him and no monsters remaining.

After what I thought was done with the map. I noticed I did not get any atlas point and no completion was given.

My atlas is showing map in progress.

https://www.reddit.com/r/PathOfExile2/comments/1jzrodv/unable_to_complete_essence_unique_map/

Reddit link for pictures