Things getting deleted

I was flying around on a server with my elytra in the nether and after a while of flying i flew into a wall and died of kinetic energy, i had full netherite armor and all my tools were netherite. The wall i flew into was right over lava so i went back to the place i died and i couldnt see my stuff. I then went into singleplayer to test this and the same thing happened, some items got deleted when i died of kinetic energy. Fix it please!