I first encountered this bug when I was trying to install a one command creation on my server. I did some experimentation, and I found out that it was because of command block minecarts.
What I expected to happen was...:
When I summoned a command block minecart or entered a command into one, a command block minecart would spawn or my command would be set.
What actually happened was...:
When I summoned a command block minecart, I was immediately kicked from my server, and when I placed down a command block minecart and tried to enter a command, I was also kicked from my server. I had to go into the console and do /kill @e[type=MinecartCommandBlock].
Steps to Reproduce:
1. Go into a 15w34b multiplayer server.
2. Do /summon MinecartCommandBlock.
3. You will see that you were kicked.
4. Either create a new world or /kill @e[type=MinecartCommandBlock].
5. Do /give @p command_block_minecart
6. Place the command block minecart on a rail and try entering a command into it.
7. If you press "Done", you will see that you have gotten kicked.
Attachments
Comments 3
Is this still an issue in the latest snapshot. From the error it seems like it is trying to read the command as JSON and is failing since it isn't JSON which I know they acknowledged in one of the earlier snapshots.
[^[1] SINGLEPLAYER.mp4]
[^[2] MULTIPLAYER.mp4]
[^[3] MULTIPLAYER.mp4]