Minecarts with passengers fail to go through end gateways

Steps to reproduce:

1. Put a strip of rails, powered or otherwise
2. Place a minecart with an entity in it
3. Push the minecart into the gateway

Observed Results:

The minecart crashes into the side of the gateway, even if powered, it doesn't bounce back or go through.

Expected Results:

The minecart would warp through the gateway just as an empty one would.