The bug

While a minecart is supposed to be moving ceaselessly on a track which includes powered rails in it, it occasionally stops or derails on curves of the track in some situations.

2018-06-30_15.04.00.png shows one situation, the three hopper minecarts in the picture were on different tracks before the bug happens. In other tests using other types of minecarts, the bug also happened: the minecarts can suddenly stop, jump onto neighbouring tracks, or jump out of the track.

How to reproduce

• The bug are easy to be reproduced on multiple minecarts that run on different circular tracks placed like concentric rings (e.g. 2019-07-01_17.35.37.png). If we use () to represent a circular track, (()()) and ((())) are both able to reproduce the bug. Minecarts on unconcentric circular tracks like ()()() can reproduce the bug as well, but it will be harder. (On ((())) tracks, the bug can happen quite frequently.)

Note

It seems that the stopping and derailing is mainly caused by the minecarts on neighbouring tracks; the stopped minecarts can begin to run again after being passed by a minecart on the neighbouring track, and sometimes minecarts change direction after being passed by a minecart on the neighbouring track.

In situations that only one minecart is present, the bug had also been witnessed before, but it in average took a very long time to reproduce, so I cannot be certain about this.