Malzahar's Voidlings no longer hides with him in the bushes?

I've been playing a few games and I've been noticing that his voidlings just stand there when I hide in the bushes. I checked the bushes for wards and there weren't any, so it isn't because the opponent has vision on me or anything.

I know that a long time ago you modified their AI so that they would hide with you if you were in the brush. But it doesn't do it anymore