Items despawn with chunks unloaded after an Entitiy Picks them up less than 5 min

Was in the nether and I was killed with a dms Fort3 unb3 eff5 mending pick and a dms chest plate with fire pro4 mending and unb3 and after the entity picked them up and I respawned the items getting back to the area after 3.30 min the mob and items we despawned, only the mob with the items were effected