Necromancer bugs? (and a suggestion)

I dunno if its a bug but when you summon skeletons with the necromancer, the creeps the corpse belongs to stops spawning so if you want em to spawn once more you have to save and load again. Its kinda annoying if every creep in the starting area is gone (if you manage to kill the skeletons will say).

An other annoying bug with the necromancer is that when you get a new skill all your summoned things dies.

also you should maybe do so the skeletons are summoned with ½ the hero level (if the necromancer is lvl 12 the skeletons is summoned with lvl 6) or base there level on the level of the mob you summon it from (a lvl 3 mob makes a lvl 3 skeleton)

Hope you can fix this or if its intended its also good to know