Before the Poolseidon patch, Nu Wa's Fog would have the occassional bug with regards to jungle camps, FG/GF, and minotaurs gaining health whilst fog was in use. However this patch has exacerbated the issue to the point where I have trained myself to avoid hitting 1 anywhere near an objective.

The only time I see resetting as appropriate is when a jungle creep is in combat and, for whatever reason, there are no longer any other targets within reach. So it resets. That I understand. This patch has changed that however.

I have had my fog active and my clay soldiers tanking the creeps (not in my fog mind you) when the creeps unexpectedly regain full health in the midst of attacking my clay soldiers. I've witnessed the gold fury and the fire giant suddenly surge to maximum health because I had myself fogged, with 4 other gods beating on him.

The worst case I've experienced is with the minotaur though. I like to play Joust a lot. As a Nu Wa player, I like to back door a lot. I've noticed recently that the minotaur, if engaging a Nu Wa who uses fog, will gain life in great spikes. A weakened minotaur will heal to max if attacked by a fogged Nu Wa. (Note: I haven't tested this with minions vs no minions). At this point in time, Hi Rez needs to disable her and hotfix her Fog, because right now her bug has rendered her Fog not only imperfect, but also beneficial to the enemy.

tl;dr: Nu Wa's Fog is causing enemy jungle camps, FG/GF, and Minotaur to regain health regardless if there are available targets within range.