i did some stuff with a hopper minecart but suddenly it was constantly jamming against an invisible barrier tried to kill the entities in a 5 block radius still there tried relogging still there even for other players.
https://www.youtube.com/watch?v=QDpfwrylavU

update. after reloading the chuck by going offline for 3 minutes probably killing the enitity it got fixed. but the cause might still be in the game.