Seems like Lilyt's ability brings back allies with abilities such as protector, stealth and ambush ie where the ability wording is bolded.

Namelessone7 vs HaveFunPlaying

T6, Lilyt brings back Nightshade with stealth and ambush.

It is cool if she can bring back the ally's passive ability but Lilyt's ability states that the returned ally or item is a homunculus with no ability. So i think its a bug.