Minecarts are unable to clip into the block in front of it by placing it on sloped rails with minecart experiment toggled on, this would mainly affect compact builds with hopper minecart clipped allowing for compaction such as for example wanting to place both a hopper but also wanting to place a furnace or obsidian as a block not able to be moved by pistons, currently there isnt any other way to clip minecarts into blocks other than pushing a block into a minecart which isnt possible for blocks that are not able to be moved by pistons, minecarts clip into blocks fine when placed on sloped rails if the experiemental is not toggled, the first attachment is with the experimental toggle on and the second attachment is with the experiemental toggle off