Video of the bug: http://usetapes.com/v/ThDbqFIayR
Entities fall through (same happens with mobs and items) instead of being rocketed upwards.
Another demo: http://gfycat.com/WindyAnyIrishdraughthorse
Related issues
Comments


This ticket has been marked as a duplicate of MC-88101, in favor of the more general or better information provided.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.