As one of the administrator's on a local server I play on, I decided to compile a Faithful texture pack mix for 1.9. However, when I went to my texture test world, I discovered that the redstone texture I had put into the pack was not rendering as the selected texture, but as the default (snapshot 1). This is not the case in 1.8 and below (snapshot 2).
Edit: For those interested, the redstone texture is taken from the CodeCrafted resource pack.