When you sit down in minecart in a creative, the character drowns in it. In order that the bug proved to be, it is necessary to sit down on minecart which moves.
Environment
Windows 7 & 8.1 64bit, no mods
MC-41751
When you sit down in minecart in a creative, the character drowns in it.
Resolved
Duplicate
0
I tested this in my creative test world and this didn't happen.