***It turns out this wasn't a bug, but a change that slipped through! Details in the latest patch notes.***
Early last week it was pointed out by Reddit user, IYINGDI_WANGYI, that The Harrowing was only reviving allies since patch 0.9.2.
That is a pretty big change to how the card worked before and seems like a bug, especially considering the text didn't change to indicate this.
- RiotUmbrage (Andrew Yip, Design Director) acknowledged the problem and confirmed "we'll address it in 0.9.3".
We should see those changes active in the next small patch, which will be on 3/31/20.