I tested Essence farming, it's bugged.

I tried essence farming using three tablets, each with the modifier "Map contains an additional Essence," plus around 300–400% increased chance for maps to contain essences from the Atlas passive tree. I also tested without the Atlas tree nodes. In every case, maps spawned exactly three essences (sometimes only two, for some reason), but never four or five.

I have been running essence maps the last half-day and only getting one essence regardless of the number of essences in maps from tablets and % increased essences in map.

Same here.
My maps spawn at best one essence, and often none, even though I have several hundreds of % increased chance to find essences.
This was working fine before (I don't know when exactly), because I could find several essences per map.

very odd i constantly get 2 or more essences per map, no essence bonus on tablets just 1 atlas points into essences from boss tree.