Disintegrate (Evoker) loot bug

Good day, today I encountered a bug when using disintegrate, the primary DPS ability on devastation evoker.

When I ran Zul Gurub I used disintegrate and in the same global it killed Bloodlord Mandokir. His body was not lootable and he laid there dead.

I chalked this up to a random instance and assumed it may have had something to do with being an evoker.

This occured again during Nighthold. I used disintegrate to kill Spellblade Aluriel and she died in the same global and was not lootable.

*edited to add, loot was not mailed. These bosses were very dead and no loot was available.