So I was excited to try and do a build with Hunger of Hadar as a kind of focal point.

Throw Water for vulnerability, Mourning Frost for Chill / vulnerability, and when the two kiss we get frozen enemies.

Hunger of Hadar isn't even receiving the Heart of Ice buff effect from the Mourning Frost staff (1 bonus damage) let alone applying chill with it.

To top it off I've read other bug reports about Hunger of Hadar not creating icy ground with Snowburst ring.

I would hazard a potentially sad guess at it not working with Winter's Clutches gloves either (yet to find a post stating such but since its not even working with the above two).

Hope this bug is easy to nip / find + fix for you guys.