The helmet slot was cleared, but a copy of the boots dropped on the ground instead

Version 1.21-2.2.284

Investigated further: When my boots slot cleared, a copy of the helmet dropped. When the leggings slot cleared, a copy of the chestplate dropped. Seemed that the slot vs drop were all backwards.

Looked in the boss code, my guess is a discrepancy between the index used for the armor slot, vs the slottype that's accessed from array: