Lolllipop: No incoming screen when lock screen notification disabled topic

I personally don't like lock-screen notifications and hence I disabled it in lollipop. However, it has a weird side effect, now it wouldn't show any incoming call screen when the screen in locked. Instead, it rings, I have to unlock the screen, click on a small call window to know who is calling or to answer the call. Not sure if this is G3 specific implementation or true with all the lollipops - in either case it's very stupid though technically correct.