The new mtx helmet "Rot Shaman Helmet" dosent count kills when slain with mines

Hey, I bought the new Kirac Pass and noticed that the helmet, which is supposed to count unique enemies slaughtered, isn't doing so when they are slain with mines.
Here is a short demonstration: https://youtu.be/lFMgejAHCWE

I likely have a similar issue, likewise on a mine build. 86 recorded even though I must have killed several hundred - probably over a thousand. (several weeks with many hours played almost daily and doing more than one strategy that spawns many unique enemies per map, both bosses and exiles)