Mojang I have a bug to report to you. today when I entered minecraft and opened my world, all my items were gone (I don't have prints of this situation) including an iron sword an iron shovel and an iron pickaxe, and some items I used

Are you playing Java Edition or Minecraft for Windows? Are there only certain items missing or is it all items in your inventory? Have you tried loading a backup save? Let us know a bit more information and we can assist! ^AM

I play on bedrock all of my itens was not on any chest close to me and not on my inventory

Try loading a backup save of your world to see if the items appear there. If you have any mods or marketplace content enabled, try disabling them and restarting the game and let us know if those steps help at all. ^AM

Nothing happend,actually,it happend again,on other world,i did your steps,and nothing happend,please fix thhs bug