Summary:
The frog's legs are not visible in the minecart.

Steps to reproduce:

1. Place the minecart.
2. Place a frog in the minecart.
3. Look at the frog's legs in the minecart.

Observed results:
In a minecart, frogs do not visible the legs.

Expected results:
The frogs in the minecart will visible the bases of their legs.

Image: