Deals an time

I was retrieving my diamond gear from a small cave system, which took very little time, and as soon as I was getting the first few items, all of them despawned. This ruined that world for me, and despawn times have always been on my nerves. It's like your not supposed to get your stuff after you die! Many an increase in the time it takes for unloaded things to dissapear? This is on mobile, bedrock.