Rootholds do not drop Fugitive Head

What is the point of rootholds if when you get to the end of the dungeon, and the boss that spawns is a Fugitive Head, but when you kill it, it does not drop the Fugitive Head as one would expect:

The whispers point the way to a Roothold.
Delve into its depths, where a Fugitive Head may have fled to.

I have run so far 80+ rootholds, of which I’ve had 5 Fugitive Head bosses at the end, but after killing the boss, I do not get the pickup item Fugitive Head itself that I need to craft my gems.

So far, ALL the Fugitive Head drops I’ve found have been in Head Hunts (“Witchtides”). I’ve yet to get a single one in any roothold in any difficulty, even after finding a Fugitive Head Boss.

Is this a bug, perhaps?