Been seeing mobs where health text doesn't show. Is this is option or a bug?

Those mobs are flagged as "minus" by the game, meaning they have significantly lower health, they're likely grouped up, and they have smaller nameplates by default. So yes, it's a feature. There's no option for it.

(you can still reply to closed issues)

Is it possible for you to add that option? It would really be nice to see the health left on some "minus" mobs that are in the game and do have a significant amount of hp.