Whenever I Place Down Nether Wart Block (I Was Building In Creative), It Makes The Noise Of Placing A Log, And When I Walk On It, I Don't Get That Weird Squishy Noise, I Get Walking On A Oak Log Noise. 

It Doesn't Really Effect Gameplay But It's Still An Issue With The Game.

With Best Regards To Mojang. =)

BTW I can't really screenshot a noise so sorry bout that.