My Items disappeared with no trace on the nether!!

So I was planning to build a wither skeleton farm on the nether, I went there, got my invisible potions, drank one and removed my armor, then suddenly a wither skeleton saw me so i covered up myself with blocks but the skeleton still managed to kill me. Before I hit the respawn button, I screenshotted my coordinates first, then I went back with new set of armor then when I got into my death coordinates... MY ITEMS WE'RE GONE!! literally not a speck of dust, I checked my surroundings, the bottom part of the nether, i mined everywhere but still nothing. Even my netherite tools and armor didn't survived yet they're fire and lava proof! I have to gather the materials for the farm again.. . And no, 5 minutes haven't gone by yet, it's still like 2 minutes, I got elytra on so I got there faster. Anyone have an Idea as to why this occurred?