Sulphuric Caverns Boss Drops Bug

Hey!

I know that I only get 2 blue drops and just from the "Summoning"-Boss and nothing from the boar on the Sulphuric Caverns bosses.
Is this intentional or a bug?
Since usually Bosses are the way to farm guaranteed Waystone Drops or any item of value this feels like a bug or wrong at all.

I assume this a bug.