Recent changes to the snapshot have radically and unpredictably changed the behavior of ALL minecarts. This means that any machine based on the old physics needs to be torn down and rebuilt, and many machines relying on compactness and combining hoppers with rails now may have no effective way of combining powered and unpowered rails to achieve the pace required to, for example, evenly distribute items across multiple hoppers. This is ridiculous. A new rail to induce the new physics would have been acceptable, but to break any machine based on the old physics without any real community input is just dumb.