Resource packs inbuilt into worlds don't work

I tried to make a resource pack that loads up immediately upon opening the map.

What I expected to happen was...:
The resource pack to load.

What actually happened was...:
The default pack loaded and I couldn't get mine up. It worked in 14w08a, so I have no idea what happened.

Steps to Reproduce:
1. Make a resource pack, call it "resources.zip" and put it in the save.
2. Watch how it doesn't load properly on load up.
3. ???
4. Profit.