No nameplate for essence mobs

In this map, some essence mobs don't have nameplates with their type and contained essences. They can still be released and behave as usual afterwards. Not all essence mobs in the map had this problem.

No embers, scarabs, or anything else unusual was applied on this map.

Report ID 1 920 455 237

https://imgur.com/1IAvzjz

Add: Same thing in the next map, report ID 1 654 526 757. What I noticed this time is that the plateless monster is not in the monster type list from the Lantern - a skelly archer, while the list only has fire mage, lightning mage, and fire melee skellies.