When I made a melon and pumpkin farm I wanted to recreate it with flying Machines and I needed to use iron bars to push the minecart hoppers in order to collect them but they get pushed through the blocks and then they won’t collect them.

Expected result:

The momentum from the hopper minecart is pushed from the block and not in it.

Actual result:

When the hopper minecart is moving by the iron bars at the end the minecart goes through the blocks.

How to reproduce:

1. wait for the flying machine to activate
2. when the flying machine reaches the return pad the hopper minecarts get pushed out of the farm.

While it doesn't affect most of you it could affect the way you make your farms.