Possible Zoe bug?

So I've yet to do thorough testing on this myself to see if it applies to other champs, but Zyra's plants do not wake you up if you're put to sleep by Zoe. Yes, damage and spells from champions will wake you up, I know that and it's still seems to be true, but it would appear that pet's attacking champs are not counted. This was pretty annoying with Zyra, but if Annie can send Tibbers after you and you don't wake up, that's damn near broken. So my question, is this a bug? Are pet attacks being treated by accident like minion attacks? (Which don't wake you up) Or is this an intended effect of this CC?