Lose things when a mob take it and put in Pacific

This happened to me in a few minutes and I'm so angry with this bug cause I lost a wither skeleton skull, a enchanted netherite sword and my armor.
I was in a nether fortress and I die cause a wither skeleton, then he picked up some of my things, so when I respawned y put it in Pacific and my game crashed, anyway I go to the nether for my things and the things that have the wither skeleton dissapeared. I want my things back pls. Idk if you can do that, anyway my username is FlaxenFerret152