DESCRIPTION: I don't have "Show Health over Enemies" activated, because I don't like the look of it. This causes following problem:
After a Boss or Miniboss spawned (for example a Lich, the Stalker or even an Acolyte), the health bars of other enemies get overwritten with the one from the current danger. That's okay, but when it's killed, this won't change - the only solution is to go into options -> interface and toggle the option to "Show Enemy-Names" off/on - to get it back shown.
On the image below, you can see no enemy-names and healthbars, although it's activated in the interface.
REPRODUCTION: Spawn a Boss or Miniboss and kill it.
EXPECTED RESULT: Seeing Enemy-Names and the Healtbars all the time, when selected in the Interface.
OBSERVED RESULT: Enemy-Names and Healthbars disappear.
REPRODUCTION RATE: Everytime a Boss or Miniboss (for example a Lich, the Stalker or even an Acolyte) spawned and is killed.
Btw., this is current since the introduction of Liches.