When I am playing Minecraft, i wanted to check out a minecart wall, so I made a device and put loads of minecart through the rails and they all fell down to the right position. Later, somehow they all disappeared, and I could only see a few.when I get to the bottom, I tried to place blocks, but it literally disappeared, too! When I placed a minecart and rode on it to the bottom again, the game crashed.

How to Reproduce

1.Build several blocks up(I used 4)

2.Put tracks and make sure it speed up

3.At the end place several blocks down again(I used 4)

4.surround the whole landing place you want(I used Length 11, Width 1, height 4) with barriers.

5. Push Loads of Minecarts down

6.It disappears.

7.Try and place blocks at the bottom, it disappears!

8, put another minecart at the same place, and ride on it.

9. The game crashes!

You can see step 6 to step 9 in the video I attached.

Bonus, when this whole stuff happens, your game sound will disappear!

P.S. I uploaded my crash log