Same happens to me.
Also, when I pause the game it sometimes stops the music playing (I'd say about 50% of the time. When I had two music tracks playing, one time it only stopped one, but another time it didn't stop either).
If that's actually a separate issue, I can create a new issue for it (unless someone already has of course).
Yeah, I'm getting this in 14w11b as well. It really ruins the look of adventure maps that use shrubs for decoration (since they can be placed on grass).