When you restart minecraft after dieing your inventory is deleted

In minecraft if you die and you dont have keep inventory on and you are messaging your friends and die you might mistakenly restart, then when you rejoin your inventory is gone! You go to the place of your death and theres nothing, it's not despawned because you got there before 5 minutes were up so you instantly look around, its GONE deleted, dosent exists and this can be quite frustrating especially if you had a elytra on you, please fix this as this is a MASSIVE program