Essences not dropping

In over three maps essence mobs are not dropping essences on killing them. I would not care if it was once in a blue moon, but last maps it was over 10+ essences that did not appear including corrupted essences. This has happened at least three maps tonight. I am on Fields maps using essence scarabs and essence map device bonus.

Were they droping before?

Have the same issue. It appears randomly. Most of the essences drop as intended, but in some maps they just do not drop after killing the monsters.
Happened to me around 3 times, so not very often, but it happens.

Have you checked if your item filter not hiding them?