Jungle patience bug

I've had a problem with the new jungle patience meters. I've only had this with yi so far, but I have yet to test with any other junglers. I find that every time I attack a jungle camp by alpha striking onto the lead monster, it will do damage to the camp, and aggro the little ones. However the lead of the camp will take damage but continue to not give a fuck as he refuses to attack, and will start his immense health regen immedietly and won't stop until I let him regen, walk away, and come back and fight him with autos. This doesn't happen every time, but happens about 60-70% which is needless to say, enough to screw with my farming especially early game. It has even happened on my starting game leash, causing a vlad and myself to auto attack an undying big krug for almost a minute before giving up, leaving me to have to return to it later. Can anyone else confirm this or see if it happens to other jgs? I know they'll lose patience if I'm untargetable from alpha, but I highly doubt they should do so THAT quickly.