What I expected to happen was...:
Player appears to ride minecart
What actually happened was...:
Minecart moves, player teleports between location of minecart and original location and/or appears a few blocks away from minecart at any given time
Steps to Reproduce:
1. Join any multiplayer server
2. Have another player ride a minecart
Duplicate of MC-1291, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.