Minecarts become invisible if a lot of them are in the same area

Steps to reproduce:

1. Import and open the attached world: world.zip
2. Press the button on the impulse command block to kill all minecarts
3. Flick the lever next to the piston

Observed result:
After some time, the minecarts in a certain area turn invisible until you reload the world.

Expected result:
All minecarts remain visible.