Despawn item when Placed.

Note: the world I played in had experiments already on.

Caves and Cliffs 

Holiday Creator Features 

Creation of Custom Biome 

Additional Modding Capabilities 

I found a big Issue.

1. If I placed Minecart with hopper on a rail everything is fine, but when I leave it for a while with a far distance and go back again it suddenly disappeared.
2. when I throw a normal trident and leave it for a while it will disappear. in 1.17.00 on android, I throw a normal trident and leave it for a while the trident is still there (I use the trident for a Mob farm)
3. when I died, the painting and armor stand will automatically break by itself.