Walk Through Fences In 14w26a

Put the summary of the bug you're having here

Normally, players can't walk through the gaps in between fences. But in the new snapshot, my animals and I were able to clearly escape through the gaps

No player should be able to walk fences on the same kind, but 14w26a allows it and this is a MAJOR bug

1. Make a line of wood fences
2. Press yourself against the fences
3. Walk while leaned against them and you will find that you can easily walk through