Flying with elytra and rockets in a tunnel I built in the nether. Hit a corner and died. Went back for everything I dropped. It was in a very small and contained spot. Retrieved everything less than one minute after dying but all the armor I was wearing and the elytra I had on were gone. Searched all over and even dug out all the netherrack around the area in case it had clipped through a wall. I'm super sad about this as it was all netherrite armor and my last pair or elytra.