I was attempting to fight the Wither Boss in the nether when he escaped containment and killed me. By the time I got back to the area, my grave was exploded and my items (plus the grave-block item) were strewn across the ground.
As it didn't pop while I was still in death screen, but was by the time I got back, my assumption here is that it was caught in the blast radius of one of the blue skulls.
I was attempting to fight the Wither Boss in the nether when he escaped containment and killed me. By the time I got back to the area, my grave was exploded and my items (plus the grave-block item) were strewn across the ground.
As it didn't pop while I was still in death screen, but was by the time I got back, my assumption here is that it was caught in the blast radius of one of the blue skulls.